JPC takes a SAPI cut. JPC can absolutely take a plate up to 1.1" thick. Whatever you do, don't get a 10x12. Get a SAPI HESCO 3610 same size as your carrier, so its stand alone, multi curved, and SAPI. If you get another brand plate make sure it is all three. If it is single curved or 10x12 dont get it. Make sure its stand alone with its own built in padding because a JPC has no padding, just a stretch material on the inside. If someone has a super tight 10x12 at .75" thick, its likely due to not getting a SAPI cut, also its likely the plate dies not ride fully to the top of the plate bag.
Whatever you do, dont get a cheap steel plate. You will regret it. You will eventually forget about the money spent on good plates and be happy with your plates for years, vs saving some money now and hatting your plates for years. Having spent money on cheap plates, it becomes even harder to justify buying new, better plates.