Made a three loop cylinder and printed with previous settings (bottom), with hotbed turned off (middle) and with PID (top). Clearly bang bang hotbed creates some artefacts even if the delta is low.
[attachment 91742 _20170309_214253.JPG]
Printed a single wall cube with PID as well, it came out with no artefacts and spot on in width.
[attachment 91743 _20170309_214152.JPG]
I'll have another go at the precious part.
(Reason for not using PID was burned electronics caused by a bad combination of psu and power expander)