The biggest issue is in the understanding of what this chassis is asking for, the same issue a couple top chassis manufacturers had at the same time frame. This leads to tuning issues in the wrong direction and quick frustration.
*** The RF does NOT receive transferred weight. The stiffness and location make a very stable frontend. It needs bite from static preload (nose and cross) and the tire itself. It will also gain turning power through involving the LR more as well. Why? Most of the weight that is tranferring is across the rear. The more the RR loads up, it starts overpowering the RF.
If you paid attention to any of the post by "racepromoter" Ken who has helped some 10-11 Excentriks on the low bite 11's-22's style tracks, one of the things he mentions is using reverse stagger split (no more than 1 1/4" front with typically 1 1/2" in the rear) which helps direct weight transfer more towards the RF and less to the RR.
Another great tip is to not jack the RF caster block to far down (lowering block, raising the RF ride height) which again if you raise the ride height too far on the RF, it will further decrease the ability of the RF to receive transferred weight.
I've seen debates on here before about the seat cradle vs. seat struts, but have never seen anybody talk about using both. If you want to experiment with something at the rearend of the chassis, please don't chop it. Instead, use the left half of the seat cradle for the leftside of the seat and use the standard RR seat strut for the rightside.