I have the JP Enterprises One Piece Flat Top Optical Mount. I purchased the following from OpticsPlanet.com:
Hawke Sport Optics Picatinny to Picatinny 1/2inch Riser, 5inch Long, Black, 22411 - 67-T8-HSONN29-22411
Leapers UTG Super Slim Picatinny Riser Mount, 0.5in Height, 13 Slots MT-RSX5L - LP-T8-SSPRM-MT-RSX5L
I thought that 1/2" would help with the eye relief. I think it did. I ended up sticking with the Hawke Sports riser.
By now, I'm sure you've already made your decision. I just didn't want you to feel all alone in the forum,searching for an answer. Sorry so late - at the time of your post, I didn't have any of this stuff.