It sounds like you could use a slow film (like efke pl100) for high contrast (sunny) where the speed loss won't be a problem, and tmax 400 for flat lighting like portraits where you can use the speed. I wish EK had tmax in larger sizes, it certainly should be the one film for them to do so, but not much that EK does makes any sense.

Luckily (or unluckily) I only shoot 8x10 so it won't be a problem for me.