anti-lift is used on the tt/a3 to add front caster, which increases steering self-centre, and adds more negative camber on turns, which helps front end grip and therefore reduces understeer.
widening the front track (relative to rear) and fitting a stiffer rear arb or stiffer rear springs also help to reduce understeer. if its an 8p then fitting the tt bottom alloy suspension arms at the front gives you more front negative camber, a wider track slightly and reduces unsprung weight.