You could conciser running an RRV as well, they don't come stock with a backplate but have that option should you choose to run one in the future, it'll give you a bit more real estate.
However, that may be cutting it close for interfering with the belt, so;
a Sped Ops MOUT rig:
I was rockin' one of these for a little while, really comfy, can hold 8AR mags and molle to boot