Monsterlover: If you have a 900, I think your bike originally came with 15 / 38 gearing.
So, your 14 / 41 is about 16% higher than stock, which is definitewly moving in the right direction.
My computer simulator says the hot ticket for best acceleration on the 900 while retaining REASONABLE rpm at 60 (4500 rpm at 60 mph), is 14 / 45 (if you can get a 45 tooth rear sprocket for that model).
If there is no 45T available, I think there are 46 to 48 tooth sprockets available for use on the 620.
Getting something close to 14 / 45 will knock about 0.4 seconds off your 0 to 60 time, and retian that differential all the way through the 1/4 mile.
However, since the 900 is a "torquer" to begin with, the improvement in horspeower available at 60mph in top gear is "only" a bit under 10%. The improvement is a lot higher for the 620, 750, 800, and S4 models.
Jim G