First of all, how'd you get 225's tucked in the back? Do any fender mods? Fikse 17's all around? Got any pix??? Kinda fond of Jeeps, aren't ya
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Couple of ideas on the traction thing, in addition to the limited slip suggestions. Since you have more rubber in back than in front, it should be small surprise you get loose up front or "push", first. Obvious suggestion is to put 225's up front. You can also adjust your traction "balance" by tweaking the front sway bar and rear spring rates. What springs are you running on the rear (I'm using 200lb)? Third suggestion is to go to a DOT legal track tire, ie the Michelin Sport Cup or the Kumho VictoRacer. You'll be street legal (and quite ready for a DE), but you'll want to avoid wet pavement, particularly standing water (duh). Not too many teener owners relish driving in the rain anyway...
I had the opposite problem, excessive oversteer, and was able to neutralize it by tightening up the front swaybar. Just gotta tweak and play. Do some searches here on "swaybar", oversteer, etc, there were a lot of discussions on this kind of thing last summer(?).