Wow, this is a depressing read. I love Regen and it's not good to see these numbers. Regen has got to be at tip top efficiency levels or it's just not going to be worth the long casting time or risk in most situations.

I agree with the "Regen overhall" crowd. Even before I knew it was inefficient to use I had problems with Regen. Perhaps something like this:

1. Increase potency and duration linearly with Afflatus Solace and Misery stored power to a point where higher tier Regen is roughly 1.5 times the efficiency of Cure, comparing like for like in terms of gear/merits.
2. Tie Regen to Afflatus Solace in a similar way to Cure stoneskin effects - "Pause" the regen effect when the target is at full HP and either resume the effect when damage is taken, or "store" the regen ticks and restore them in a lump.
3. Reduce casting time by 25%.

Something like this would hit all of Regen's problems - (1) the efficiency, (2) the issue with people curing over the top as well as "pre-emptive regen" on tanks, and (3) the difficulty in using Regen in situations where we've got to be fast. Tying 1 and 2 to Afflatus stances keeps Regen a WHM speciality, regardless of what SCH wants everyone to believe, and provides us with more unique tools when RDM and SCH inevitably (and deservedly) get access to their Cure 4.5 or Cure V.