P2 is correct in everything he has suggested.
The things I would try first are the front brace and widening the front track. I find the 12X FRP front brace to be the best. It will fit on both cars.
Be careful when shimming the front axles not to use shims that are too wide, or they will catch on the bearings. I use two 0.5mm Hot Bodies kingpin shims on each side, gives a front end width of 165mm. In fact I've glued them on so I don't lose them!
If you are running on carpet I'd try Associated .020 front springs too. The kit springs are too soft.
Trev