I need some tips on toning down understeer. I am using the easy racing setups (credit to the Bob Smith) but I want to dial out some of the push. I am new to set ups and the changes I make seem to make the car very twitchy.

Add a couple of clicks to the front wing to increase downforce.

I know the easy race sets push too much atm, all you need to do, if you want to keep thigs simple, is stiffen the rear anti-roll bar a little bit.

Or reduce the front ARB and reduce front bump by a click. Remember if you increase ARB by more than a couple of clicks you will need to increase negative camber slightly to maintain the angles. Same the other way around - reduce front ARB and you will need to add some negative camber. The reason for this is that stiffer suspension deflects less and most suspension geometrys increase negative camber in deflection.