In addition to what Butch says above make sure that you are running the longest possible camber links all round.
Front 2mm shim under inner ball stud, 2mm shim under both rear ball studs.
After that it try moving the upper end of the shocks to the inner most hole on the towers. Run the cells in the rear most possition too.
Still think a one-way might be worth a try to remove some of the corner entry understeer.
See if you can get hold of an editable set-up sheet (think there is one on PetitRC) and fill that in and post that up, will give us a better idea of the over all setup.
I can only think that the tires aren't working well as the only time I've ever had any form of true understeer on the FS it was because I'd fitted the wrong compound of tire to the car by mistake.
Its unfortunate that we don't run on similar surfaces but as I say we'll do our best to help, might just take a couple of itterations to get there.
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