suspension setup

[fax0815]

Hi,
this the first time I need to think about a suspension setup ever, please excuse all the questions...

I´ve read a lot about suspension parameters in general, but need opinions from people with expirience, to find a basic drift setup for my AE86.

It´s a drift/track only car, with TRD coilovers ,8kg/mm springs, adjustable top mounts, NRCA´s, DW tension rods, T3 tie rods, servo arms, polybushings and I usually run normal road tyres.
Also changed the steering rack so everything is out of alignment.

The rear is pretty stock except for 8way TRD blue shocks and 6kg springs, not like that there´s much more to adjust...

I´ve had understeer issues, but I blame the lack of seat time, sh** tires and the new TRD LSD for that, still want to buy the Whiteline swaybars at some stage...

That´s what figured out might suit me, reading a few posts on here.

camber: -4° (pretty sure it´s enough?)
castor: +4° (how bad will straight line driving become if I take more?)
toe in: 0.8° (I know what it does but no idea what to choose here )

Please help me...