it's abs so - heated bed.
I'm not going to be printing organic models very often. So I can happily live with that. The 24v fan might shift more air - should be here by the weekend.
I did print out a model dimpled glande (ancient slinging bullet crossed with modern aerodynamics) with a much smaller initial 'footprint'. And that was damn near perfect.

I've got a roll of pla I haven't really used - so might see if that's any better. Plus I need to try the nylon again.

Not to mention the dual extruder printing thing. And making some bed clips and moving the on/off switch to the front...

This is not a hobby that'll grow stale in the forseeable future :-)