the low speed stuff may be simply other set up stuff, like chain adjustment, carb balance, idle mixture settings, but the higher speed bit sounds like the thing I was getting.
The throttle pot will affect things mainly at lighter throttle openings because I'd assume it'll get to a "full load ignition" curve by mid throttle opening somewhere. Anyway, well worth a check if you have a multimeter to hand.
Throttle pot is a small black plastic device on the righthand side of the rear carb, just lift tank and there it is, 2 phillips screws. It has a triangular connector which is the usual thing of push in the little tab to release the catch and pull apart.
It's in "Fuel & Lube" service manual section 4-33.
http://www.sv650.org/sv_manuals.htm
Measure resistance of track (Resistance#1, you'll find it's very close to 5k Ohms), then hold throttle open and measure resistance#2.
If you need to alter it to get 78% of the track value, make sure you have a good condition phillips/crosshead screwdriver (NOT pozidrive) which fits the screws very well because they're the usual cheese, and a bit of WD40 or similar first might help. There's not a huge amount of adjustment, mine's almost at the end.
EDIT - johnnyrod beat me to it!