Okay, so I did my third week inspection and had a very clear signal that I need to stop doing these for the time being.
No problems in the hive itself. Still got capped brood with no sign of eggs, spotted what looked like an empty emergency queen cell and another queen cell that had the top opened a bit (could see a bee inside that did not appear to be moving), so should be okay there.
The "Okay, time to stop this" moment came when due to multiple layers of clothing and 90+ degree heat I went lightheaded and almost dropped the brood frame. Luckily I held on to one end and it swung down perfectly in the empty slot below it, didn't look like I did any damage with it, but that was definitely my "Okay, put it down and walk away" moment. Should have seen it coming though, I was sweating so bad it was dripping through the veil down onto the frame bars (maybe bees like a little extra salt?). Didn't realize how overheated I was until I got back down to the house and nearly had my knees go out from under me. Yeah, time for cold drinks, less air conditioning, and more time spent outside to acclimate to the heat more.
But yeah, the bees are going to do what the bees want to do, and at this point other than satisfying my own curiosity the frame checks only stand to cause potential harm, so I'm done with that for now. I'll still check on them to see if they've finally reached the point where they could use the second deep, but no more frame checks. Last thing I need is to have them finally get a new queen and me accidentally kill her.