Thoughts

re: heat loss, slotted properly, if you can tag 8 enemies, you should get 1100% or so recovery. You'll get random toggles dropping depending on your luck, but usually some stay up. (Heat loss end recovery scalars are the same for both corr and defender, so either way you go, you should be able to have fun.)

Sounds like a lot of fun; you could probably see some ridiculous numbers going Sleet -> Heat Loss -> Inferno, and if you tag enough mobs you'll have recovery through it as well.

I took a Cold/Sonic to 50 recently, although I took Dark Mastery to build on stuns in the secondary. I figured out faceplanting isn't as big of a worry when you can get back up every ~2-3 minutes, and get a mag 30 stun & 10 secs of untouchable in the process

Have a fire/ice tanker (now retired for various reasons), but consider slotting up frost with 3 dmg/range HOs + frankenslotting IOs. You can nail a surprising amount of enemies with that cone maxed out since the angle is so wide. It's the one thing I miss since I've switched to MA.

I have a IOed out WS build I'm running at 50 (that isn't too prohibitively expensive) that I can drop in here if you want some ideas; no LotG, so cheap enough that it can be afforded without too much grinding post-50, but lots of room for expensive replacements as you get them too. PM me if you're interested, not gonna interrupt your thread