Anything less than 4k or 5k in the middle is just too thin. The car will unload under acceleration to the front or the rear wheels and wont be as fast for sure.
TCD- 5000-2000 works fine or even 3000
Go to the Starting grid
www.sgrid.com and enter the kyosho forum. Find Mark Pavidis's setup and this will get you on the right track. From there it's up to your personal preferences to alter the car.
BTW 2-3-2 is something that simply wont work. Unless you are just bashing around and you dont care about laptimes.