The main tank with the flat bottom does cause issues at low fuel - I had the Jet Tech version of the tanks - I can't remember if it had a baffle - I don't think so.
I badly damaged my UF on finals when the engine didn't respond to the throttle and I landed heavily short of the runway. I had about 40oz of fuel remaining and it was sucking a lot of air and it was on the brink of flaming out, but was continuing to run roughly.
I normally landed at around 50oz remaining, but cut it a little short that flight and it bit. I always landed with more than 50oz remaining after that. Bingo fuel alarm was set at 60oz. I still managed 7 min flights with a Merlin 140, using the main and 2 saddle tanks.
Paul