The stock foams are pretty much garbage by them selves, but the Panther F400 foams are a great replacement, also try about 6oz of lead stick on weights wrapped around the front wheels its self, if you can still get them where you live, then mount the tire and foam onto the wheels, leave the back wheels alone with no weights, this will give your rig a forward weight bias and help keep the front end down on vertical climbs. It will also make it easier to get the back wheels to hop up over ledges and stuff.