Ciao Tom.
You have purchased IMHO what is one of the greatest all around bikes there is. [thumbsup]
First thing to ask you is if your Sag, Compression and Rebound settings are set properly for your weight.?.
Stock the S4Rs is sprung for a 160lb rider. After being unable to get enough preload dialed in to have my bike operating in its sweet spot (The upper 1/3 of its total range) and having actually bottomed my suspension a few times when really pushing it hard on a very rough road. I changed my fork and rear springs to a 250lb aggressive rate springs, and now she is perfect for my 6'3" 215lb frame.
As far as feeling very light / hyper sensitive in steering, and riding high in the front, this is normal for most monsters when stock.
The wider flat bars and the more upright riding position take some getting used to when coming off of a repli-racer with clip-ons.
Lighten your grip on the bars, and use allot of body English. IE: keep your upper torso way forward and to the inside of the corner directly over the grip nearest the inside of the corner. Counter-steering and bar inputs on these bikes are very light / touchy compared to a clip on equipped repli-racer.
The bike responds as much if not more to body position and weight transfer, and throttle inputs, as it does steering inputs. Proper weight distribution really settles these bikes immensely.
Depending on how tall or rather inseam challenged you are, the easiest fix to get more weight over the front is to have the adjustable rear ride height link raised 1". This will give the front a more planted feel especially under throttle. It will also make the turn in much easier and sharper. You only have to think about turning and they turn. They almost FALL into corners. (Note: If your rear compression is set too soft the bike will transfer too much weight to the rear (squatting under throttle) and causes it to run wide also.) (Too much compression damping on the forks gives the bike a nose high attitude and will also cause it to drift wide in the corners.)
Even with the bike set up and dialed in, the wide handle bars offer tremendous leverage (this is the majority of the lightness you are feeling.) You have to retrain yourself to have a very light touch on the bars. Small bar inputs have immediate and substantial results. Also holding on too tightly instead of using your abdominal muscles and legs to grip the bike can cause a slight weave that is rider input induced. If you still cannot get use to the added leverage you can add a steering damper, or clip-ons to negate the effect.
When adjusting your damping make all of your adjustments in small increments and take notes as to how it feels to you as well as how the bike is responding to the adjustment. There is no common setting that works for everyone, and has allot to do with your body type and your style of riding.
You can easily drag a knee on an Rs once the bike is dialed in. It takes much less effort to do on the monster than on a repli-racer, but it is a different feel to the hanging off position also. You'll feel your hands will be much higher in relation to your upper torso than on a clip-on equipped bike.
Take the time to get her dialed in and you will love her. You'll get used to the lightened steering after riding her a bit so don't rush to slap a damper on her till you get everything set up for you and your riding style.
Putting a damper on too early can mask problems with your settings, and in turn hamper the dial in process.
Swapping to clip-ons while improving the bikes for lack of a better term "track manners", will have a negative effect on it's comfort in long distance stints.
Once set up the S4Rs' Trellis frame is good enough to ride the bike completely off of its wheels. It's only limiting factor is the riders skill, and I for one am having an absolute blast TRYING to tap into even half of the actual outright potential of the S4Rs package. [laugh]
<Edit> I just noticed you also own a turbo Busa. That explains ALLOT!!! [laugh] [laugh] [laugh]
I used to own a 99' Busa, and the Rs handles and responds much differently. More sensitive to set up, yet much lighter and more nimble. Much more sensitive to throttle inputs.
Where you have to really crank on the Busa to compensate for the higher weight and less bar leverage, and a mile long rock stable wheel base to hustle it through the twisties. The Rs has the same hypersensitive feel of an R6, but with even more bar leverage, less front end weight bias, and only a slightly longer more stable wheelbase in relation to an R6.
I can see how this is a big change for you coming off of a long low heavy Busa. Once you get used to it you'll love it!
I actually find it infinately more entertaining than my old Busa. It doesn't have the outright terminal velocity of the Busa, but with the full Termi kit its not off by much, and accelerates almost as hard as a stock Busa. It's a real challenge to keep the front on the ground and take full advantage of its power to weight!
While the stock Busa wheelies easily the Termi equipped Rs wheelies even easier! >

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Very different creatures, from completely opposite ends of the sport bike spectrum.
I'll bet you've added an extended swing arm to harness the power of your turbo Busa. This would only magnify the differences you are noticing between the two bikes.
Hope this helps. ~SC