I'm trying out a difference in settings I found here. I'm hoping by also lowering my "Infill Perimeter Overlap" ratio while raising the "Infill Interior Density over Exterior Density" ratio to 1.0 I can get slightly better prints. I've had a few successful prints in 4043D PLA, and I'm continuing with that.
It appears after further attempting to print, that at present I cannot reliably print with PLA. I either need be able to print with a higher flow rate or not have a bowden cable in the middle of the extruder assembly. the heat from the hot end is travelling up the pla filament into the bowden cable where it softens and creates blockages. quicker prints would forgo this, but best would be quick prints without the cable assembly.