if you're printing pla at 235 - then you have a serious issue with the either the hotend or the temperature sensor.

I can push pla through at 150mm's for a 0.4mm layer height at 210.

For the speeds and layer heights an ender will do you should never really need anything more than 200 or 205 at the most.
Your new hotend is not right.
Something in your setup is lying to you.

I'm guessing this is not a genuine micro swiss - but a cheapo chinese clone. Could be the heat cartridge is deliberately underpowered and they've done something to the thermo sensor to 'compensate'.

This does sound a bit paranoid - but |I've seen a few videos about 'cloned' chinese computer components recently - and I don't see why the same approach wouldn't be used with 3d printer parts.