Plowboy, it sounds like you should have gotten the 551 instead of the 552, for the cramped BUIS situation. It is a bit over 1" shorter because it uses "N" type batteries. That would give you a lot more room for the controls on your flat top. As mentioned, a riser is only used to raise the optic, so that your BUIS will cowitness lower in the FOV.
As far as not liking the reticle....well, the EOTech is designed for BOTH EYES OPEN, fast target acquisition, wide field of view, close up combat. I think it is the best optic going for those requirements. It is intended for you to be able to focus on your target(s) while firing, not the reticle. It sounds like you may have been expecting a "scope" type optic with the EOTech. Its not a scope, those belong on precision rifles, not QCB carbines. Decide what purpose your optic is intended for, and if the EOTech isn't it, sell it on the EE. Good luck.
ETA: I noticed you mentioned that you liked a single dot better than the circle/dot. EOTech makes a 551.D1, (as opposed to your 552.A65) which is a shorter version of what you have, with a single dot, no circle.