noel prolly suggested this last nite, but them tyres at 18psi will help alot
yeah u should be able to adjust them a bit, u gotta wind the dampner knob on them. you know what model teins they are? they've prolly got ~10kg springs in the rear lol. the drag spec coilovers i've seen (the HKS ones for example) have ~4kg rear spring rates!
u getting any/much axle tramp off the line? best way i found to see if a car has axel tramp, was to bag em up in the wet in a straight line, the wet road will exaggerate the tramp if there is any
other than that, u could spend a few dollars on more suspension goodies