System won't run without a stick inside the first RAM slot. The ram kinda has to be in order. While it may appear physically you're placing RAM into 1st and 3rd slot, to the system it's actually 1st and 2nd.
Those temps are quite hot still, even though I can't trust the individual CPU core temps (they're popping up zeroes frequently). I'd like to know what the Aux temp is, since that's growing up into 90C temps.
Have you confirmed that your case fans are working and are actually pulling external air in and internal air out? If it isn't at the very least pushing the inside air out, then the inside will turn into a veritable oven. I don't think this is the case personally, since your GPU would be scorching as well but it's showing up very nice temperatures (40C range), but it's still worth a look.
We'll see what comes about from the CPU cooler replacement, in the meantime, I'd strongly advise against further CPU testing and any high load activity. If by God's mercy the CPU isn't already been cooked by your temps, then doing heavy activity with it isn't going to help.