No it would not be too much with out a bumper, unless your super picky. The bushing should get your castor close to back in factory range or in factory range. As far as the spring rate it works perfect too. My inbox is no longer full.
you have an OMEJs now and you don't have the ARB BB and rear bumper, how's the ride? Is it bumpy, harsh, or hard like when you hit a speed bump, your head about to hit the roof. Do you get any rake?
I have not really got a chance to drive it much with js, but from what I have I liked it. I live in the hill country and our roads our windy with hills and it handles much better now, no more excessive body lean. I put 1 10 mm spacer on each side in the front to reduce the rake a bit, now I have a very manageable amount of rake. It does not look wierd.
MoJ, I would like to sell the springs together if I can, but if someone offers for just the rears I will let you know.