| Its interesting to read Neil Hodgson's comments in 03 when he went from 998 to 999. They spent time trying to get the bike to change to suit him but in the end he just adapted to the bike. It does require a different riding style with weight a lot further forward and almost pushing the bike back wards, i also hang off a lot more than any other bike I've ridden, it means you have to transfer weight quickly so a lot of effort through legs and feet.
Steeping a bike reduces rear grip so whilst you'll turn in quicker you'll have to be more careful on the exit. One of the big plusses of the 999 is how fast you can put the power down between corners, you'll sacrifice some of that drive so whilst it might be quicker on corner entry it won't be overall.
I tried a number of rear ride heights and fork lowering, I'm now back to 285 on the rear and only run 3 rings showing but usually setup mates 749/999's with 4 rings as everyone makes the same comment on slow steering. I run a softer front (Power Race soft) so i can load the front, i wouldn't want it any steeper and have never seen the need to try the race head angle.
I assume you've got rear and front sag set correctly as having them 10 -15mm out each end in opposite directions would influence things as much as altering a head angle  |