The BRP will be faster. Its a direct drive car, and a heck of alot lighter. However, if this is as rough as you say, the independant suspension and 4wd of the m18 might help it if you cross these strips more than the t-bar and Rwd.
More than anything, it sounds like you need more rear traction if you cant get the brp to aim straight. Traction compound? Softer foams? Harder front foams? Softer t-bar? (Have you checked your tbar tweak?) Loosen the diff a tiny bit (your using the ball diff in the brp right?)
Oh one last thing, the V2 you can fit 4 cells on one side and two on the other? I would do that since you would shift the weight better for oval. The xray would have an advantage here if you made stick/shotgun packs. And have all that weight on the left side.
If you decide on the xray. Use stiffer atomic springs on the outside. Harder front tires, a rear ball diff, and especially which would help on a oval - A front one way. Offset the car so, the outside tires are shifted out, and the inside tires are shifted in. Heck, maybe even use a front tire on the left inside rear. Don't use a super stiff upper brace (Stock fine), as having the chassis flex over these strips will help. Again, 6 cells on the left. Maybe mount your transponder on the left also.
Im not a big fan of oval (Ok, I pretty much hate it), but I have run it enough that the above would help you get a good basis.
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