Any problems with doing a brisket really slow?

[freakaccident]

I'm willing to bet that part of your oven issue was due at least in part to the foil covering the drip tray.  You were trapping the heat underneath the foil and not letting it rise through the vents in the tray.  As for "there was no fire", consider yourself fortunate.  Bullet dodged.......this time.  That being said, it's your Bradley so do whatever you choose.

I'm glad I dodged the bullet on that. Thank you.  I won't do that again. 

None of the issues I had were related to that though.