Well, I think you've sold me on Misdirection! I hadn't realized that it included a nice resistance debuff as well. It also helps that it's another power that can get by with no additional slotting and still be quite useful. And of course you're already going into Concealment for a couple of powers that can slot LotG +Recharge IOs, so all in all it seems like a pretty solid option compared to some of the other additional power choices out there.
As for Solar Flare... I find I'm really liking Radiant Strike since picking it up a few levels ago, so at the moment I'm rather reluctant to swap it out. Also, if I'm not mistaken, the Knockback to Knockdown IO is unique, so I would have to choose between slotting it in either Solar Flare or Dawn Strike, yes? I would have guessed that it might be better to put it in Flare since that power should likely see more use over time, but I see that you left it in Dawn Strike in your newest build (the one which includes Solar Flare).
On the flip side, I do find the additional AoE-focused strategies listed for your Solar Flare build to be quite intriguing! I suppose I may end up taking both Radiant Strike and Solar Flare in my build just to try them out and experiment for a few levels, and then performing a respec after deciding which I like better. In an ideal world I might ultimately keep both, but it does indeed seem like enhancement slots are comparatively hard to come by for Kheldians, and especially in tri-form builds. And with enough recharge it sounds like both wouldn't really be needed anyway. Decisions, decisions...
Thanks for the additional insights! :)