[scooby doo]

Hi guys. i currently own a 02 Sti Type uk. I have fitted new Kyb Ultra SR shocks and H&R sport springs the other day along with new oem front drop links, the car also has strut braces front and rear, and nearly new Hankook ventus v12 tyres all round on rota gra wheels.
brakes are 2 piece front rotas and track pads, stock rear.

Now i took the car out for a real good stick last night out threw the contry, mix of tight and sweeping bends, and i'm not impressed. it feels very unsatable, the rear feels loose, coming into corners i can feel the rear starting to lift, and on exit its kicking the rear every time. once i got understeer which i expect alot more to be fair.
i just seem to be fighting the steering wheel alot,

can anyone help with suggestion what i could do with improving it..

I think a new rear arb and geo?