A few things I found most important when I first starting with the 8th's:
the trigger, don't Yank it like you would a TC, coming off a corner, pull the trigger slowly at first, till it gets wide open.
Secondly, keep your tires with the split the Manufacturer suggest, I don't know what it is on a Kyosho, 7mm on my MRX3,there's night and day difference between a car with the right split( and Ride Height
) and one that is off.
You also might try setting the car up softly at first, so the car doesn't slide too much, till you learn the trigger stuff, then later go to the stiffer settings the fast guys are running. It'll help keeping the car straight under acceleration, they can spin the tires all the way down a straight.
And lastly, dial in that rear toe-in, that'll help keep the car straight under hard acceleration.
8th scale is the BOMB! Isn't it? I've been running mine about 8-9 mos., and I just had my 1st TQ this past weekend, with a full heat, and every raceday I've been setting personal best laps, I Love driving these cars.