Looks shiny. The infusion process, in particular, really intrigues the engineer in me- at some point, I might have to come up with a spreadsheet of some sort to help optimize it.
Any thoughts on infusion reagents that mostly decrease the RF/t, purity, lasting time, or crystallizing time of the fluid? This could be a way to implement your "extreme mode": lower the purity to open more "space" within the quality of the fluid to jam in more RF/t- and lasting time-increasing reagents.
Also, any plans to provide some way to regulate the amount of fluid in a tank, or are you just going to leave keeping the smelter tank half full of lava up to the few mods, such as Buildcraft, that can detect it?
Suggestion: Make your tanks work with comparators, and have some kind of highish-tier RF-powered pump that can be turned off with a redstone signal.
...Wait. I know that RFTools has a liquid monitor, but I don't remember off the top of my head if it can output a redstone signal depending on the level of the fluid. If it can, that's perfectly fine. I don't see much need to add something like that into Deep Resonance if RFTools already adds it.