If I read your post correctly then 0.4 degrees per side is too much toe in IMHO, as stated in an earlier post rear toe wants to be in the region of 20 minutes total (10 minutes-1/6th of a degree per side)
The front of the chassis I would suggest to be 20 to 25mm lower than the rear of the chassis, normally measured at the front of the floorpan to the rearmost cross member.
I think you will always get some tramlining as the rear track of a GP4 is wider than the front track so the rear wheels will always follow a different section of the road. the wider the rear tyre the more I think it will show itself, I see you have the 295 TB15's though which shouldn't be too bad.
Constant movement of the steering wheel can be either bump steer or rear end tramlining, if you are happy that you have no bump steer then I would think that you are correct in the assumption that the rear is causing the issue.
Where are you with negative camber now?
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