Things to check (this is generic advice since I'm unfamiliar with your car):
1. front tyres. What compound are you using? What profile? How wide are your front rims? Are the sidewalls stretched & more rounded? Running 2wd tyres on 4wd rims will stretch the carcass & limit the contact patch. Tyres are always the first thing to check.
2. front camber. Sometimes less is more - as in, try running 0 - 1 degree for a flatter contact profile. Also investigate the effect of the turnbuckle inboard mounting points, as this changes the rate of camber change (a longer link will result in little change, shorter = more camber under load)
3. where are you encountering the understeer? Corner entry? Mid corner on power? Corner exit? Are you braking at all? braking in the right place forces weight to transfer to the front, which will increase bite.
4. front toe - are you running toe in, neutral, or toe out? Toe out will increase steering on corner entry but may make your car 'darty'.
5. wishbone binding? - remove or disconnect the front shocks & make sure the suspension moves freely, both sides.
6. Diff: Ball or gear? And if gear, how heavy is the oil? A very stiff diff will cause understeer on entry, since a tight rear axle limits the rate of rotation, especially using mini pins on carpet.
Understeer isn't necessarily bad. Remember, your arse isn't in the car. Oversteer can be slower.
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