Thanks very much for the quick responses!
I'm using SAS/Retrograde tracking during the descent. It seems that Science Junior blows up, without ever being listed as the "hottest component." I believe I had it adjacent to the capsule, with the cargo bay then between it and the heat shield.
I'm guessing I was coming in too steeply, though, based on your comments. I do typically aim for about 30km for my periapsis on re-entry. I was closer to 5km, though. I thought I needed to be steeper due to the extra speed, so as not to bounce off the atmosphere. I thought that due to previous failures, where I did indeed bounce off, orbit again, bounce off again, etc., until the heat shield was out of ablator. Not the worst experience ever, but it may have set me up for failure this time around, as I took the wrong lesson away from that. I'll be sure to pay closer attention to that as I move forward.
When the Materials experiment would blow up, it would throw the rest of it end over end, and eventually everything would go. I did manage to keep the capsule and pilot, though. So, while I lost a little bit of hardware, at the end of the day (and 3-4 restores from save) I had recovered the kerbonaut.
Again, thanks! I look forward to both learning more, and ultimately contributing in the future!
Chads