Have you completely purged all traces of ABS from your barrel? If not, heat it up to about 210 then extrude about 400-500mm to be sure all ABS is out.
I print PLA between 170-185 on mirror with a light dusting of extreme hold hairspray, 70 for bed temp, and for some reason, I olny get good results when my feed/flow is set around 140/140. The slower I print, the worst adherance I have. No idea why.
Also, with PLA, I almost always have to reprint small prints. The bigger prints better in my case.
But if the problem is that the filament is coming out clear after some time, you may have a VERY bad batch. What brand and color did you get? Different colors tend to behave differently. Red Makerbot requires me to run 182-185 whereas the purple I can print just fine around 178. JustPLA green (garbage and cloggy) prints well around 165-170.
As far as calibration, I can't calibrate my extruder with the new RH (some others have reported the same issue). But certainly calibrate your extruder and level your bed either way. It's also best to have a mounted fan when printing PLA.
Printit Mason and Printit Horizon printers
Multiple SD2s- Bulldog XL, E3D v5/v6/Lite6, Volcano, Hobb Goblin, Titan, .9 motor, Lawsy carriages, direct Y drive, fishing line...the list goes on
Filawinder and Filastruder #1870.....worth every penny!
