1100 EVO Front Brake Issue

Those are classic symptoms of having air (gas) in the system. The gas has probably been created when the calipers got hot during the track day, and the brake fluid 'boiled' which created some bubbles. The problem with the air is that it is compressible, and the first squeeze of the lever compresses the bubbles into smaller bubbles before any movement of the brake pistons occurs. Once you've done that first squeeze the built up pressure in the lines will keep the bubbles small, for a while, and the brakes will work almost normally. But after its been left idle the pressure in the lines will drop again (through a tiny port that connects to the master cylinder called the compensation port that is only open when the lever is fully out) and the bubbles will expand again.
You need to bleed the air out of the system.
Luckily the 1100evo has a bleed valve at the master cylinder banjo bolt, and you can start there.

Also try removing the LHS (from perspective of the rider ie: the clutch lever side) caliper and suspending from a high point on the RHS of the bike, so-as to straighten out the section of brake hose that loops over the front mudguard (fender).
This will allow any air that has accumulated in the high-point of the loop to travel up to the LHS caliper where it can be extracted. Also try lightly tapping the bodies of the calipers with a metallic object (like a small spanner) to help dislodge any bubbles that are 'sticking' to the walls of the calipers.
Before you bleed calipers that have been removed from the rotors try pushing the pistons fully into the calipers as well, that will push out any bubbles that have accumulated in the slave cylinders, then put something firm (like a piece of wood) between the pistons before you start pumping the lever so that you don't end up with the pistons jammed hard up against each other.

cheers, Keef.