Jeremy, it sounds like you have yourself an excellent solution.

However, if you're still interested, this here is the O Ring Bible: https://www.parker.com/literature/OR...g_Handbook.pdf

Ingest all of that and you'll have an ok understanding of all the seals involved. Personally, I tend to run a bit more stretch on the O rings I use (a more shallow groove), but that's because I come from paintball pneumatics, where you're on the edge of a good seal and really low friction. For 60+ bar use, stick to the handbook and you shouldn't go too wrong.