Wow. This is interesting and fortuitous to read this here.
First I have to admit to being lazy and not reading the whole thread (sorry, but it's late and I'm new to the forum.. I'll catch up later).
I just want to say that I was working on my own 3604 balance mod way back when, and one of the things I tested was super regen on the Ilshavoh. I never tried giving regen to everybody, although I considered it for a few other Sera units.
I love the 3603 T2 tank rebalance, except that it screws the Seraphim even more because it slows the Ilsh down so much that the T2 bot really overlaps with the speed/range/role of the T3 Othuum tank. I've always envisioned the Ilsh as an early/light SAB, so I thought it should be faster (and the Sera need a fast bot for raiding and pushing back vs Mongooses and Hoplites).
So, to keep it balanced vs the Rhino, Pillar, and Obsidian, I nerfed the Ilshavoh's HP down by a chunk and then I gave it a very high regen that balanced things out so it would have the same effective HP in a 1v1 vs another T2 tank. I also gave it faster speed (so it could raid and scare kite bots), and I nerfed its range so it couldn't kite the other T2 tanks.
After testing I actually thought that this approach worked pretty well. Ilshavohs could compete with other units by using feints and hit and run strikes that let them focus down a few units and then retreat for a rapid regen of their HP. But, because their total HP was actually lower, they were very vulnerable to being focused down or alpha-striked by strong enemies.
..So, this may not be on topic, but after reading Funk's post I had to share.
If anyone is curious I could post some more specifics or share the blue print later..