I still think the Acrid smoke is your clue! No filament should be burning to produce smoke at 225C !.
There is no way in correct operation the heater block or any part of the hotend should get to a temperature that can result in acrid smoke.
PID control systems do overshoot on heating up but that should not take you even close to the point when the filament would burn, This can only occur if the heater is way to hot and the thermistor reading correctly. You might have a faulty thermistor it may be intermittent partially short circuit causing it to give low reading.
I had a similar problem with my Sapphire Pro when the heater element was not securely and completely in the heat block due to a stripped thread on the grub screw hole locking the heater into the block. I had o change the heat block to one of a different design.

In any case I think you should find out why you have acrid smoke first and take it from there.