For the front, you can flip your rims.(free- 5$)
Set your rear pre-load all the way soft.(free)
I don't have any TT experience, but from a few flat-track event's ive been through and one I participated in, you can run 300ex shocks on stock a arms on a Z,KFX,DVX, but you can't hit anything too big or you land hard if theres not a nice downramp. You can usually pick up a set pretty cheap off of ebay, and as a bonus the shorter shocks also make your fron't end wider. For the rear a set of wheel spacers would be your best bet.
04' YFZ 450
06' LTR 450
03' Z400
01' 406EX- R.I.P
97' MXZ 583
02' mxzx 600
District 34, #450
Aim: Hippiekicker 250