Well don't fret over the monetary amount in your chassis. NOW is the time to be LEARNING how to 'tune' all that adjustability. :-)
Need to spend a day or a few evenings and set the car up to a 'base line' setup. Square the front and rear axle lines, corner to corner/side to side front to rear. Write EVERYthing down in a log book. When at the track, make ONE small adjustment at a time. JUST ONE. write it down, and also note what the change did in how the car felt or reacted. Making any more than ONE adjustment at a time will get you so lost off the base line you'll never get it back, except back in the shop.
We've discussed this very subject a few times here on RJ, so I know we'll be able to head you in the right direction.
Chassis twist under violent launches can be reduced by increased tire pressure on right rear, stiffer shock setting on RR, some 4 link adjustments.
You might shoot us some pics of the cage and rear suspension. Pics ALWAYS help !
A properly built cage will turn the chassis into a 'gerder' type bridge, VERY stiff.