No, I haven't seen that happen. I'm currently running a twisted 28g ti coil at 0.22ohm, 30J and 345°.
No, its never hit the tp.
Roxy
if you cant hit your TP setting of just 345f
then either the joules are too low or the locked resistance is too high
had the too high locked resistance give me some head scratching
found that a 0.265 coil locked in incorrectly at 0.283 was all it took to throw it out
now I make sure my coils are locked in bang on steam tuners predictions and never have an issue
the M class works fine with Ti at 260-280 with out the test upgrade & at 480 with it