po2

[DRE]

Just fill all your tanks with EAN32 and forget about the EAN36. You get little benefit in terms of deco from the 36 over the 32, plus it's a good idea to not constantly push toward the 1.4 either in terms of CNS.
The biggest advantage of using the same gas for all your dives is that you will never use the rong gas at the wrong depth, ie take you 36 to 130. Personally, I limit myself to 100ft using EAN32, anything deeper I'll use TRI30/30 or 21/35 (but that's another debate ). Keep things simple and don't worry too much about the optimal PO2 - since your exposures are pretty short your deco benefit is negligeable.