Rear camber issues

[Numplumb]

Hi yours must be completely different from mine.
I can't see how your upper wishbones will move from where they are now, by making the adjusters longer it seems to me that if you have them set at the moment with 1% neg but not enough thread left in the wishbones by making them longer will leave them as they are but with more thread in the wishbones.
Equal length wishbones is not a good setup shorter uppers is the best.
Regards Mick.