If your problem improves after reduce retraction length, check for resistance in your extruder, ptfe tube and throat. Also check for partial clog at hotend. High resistance in filament feeding can make retract very efficient but insufficient re-prime. Reduce retraction length will alleviate the symptom.

Thanks for the advice.

I'm using XYZ PLA jr
Have tried temp from 190-215.
And speeds from 1000 mm/min to 2500 mm/min.
No changes.
I have added the XYZ fan part cooler, but it didn't change the results before or after.

A hour ago I was reading up on Da vinci Jr retraction causing issues, so I changed it from 5 mm to 2 mm.
It seams to have made difference, but now I'm getting stringing.
I guess it may be sitting and tweaking my retraction settings till I find a good balance.

They seam to come out pretty well, but none required supports.

However whenever I try printing anything that requires supports within a few layers I start getting the extruder clicking and what I assume is under extrusion over the whole print.
I assume it has something to do with the fact that supports print differently to normal layers.
It does it in both XYZ print and Simplify3D.

I don't think it is related to Z height or temperature, as prints with no support are fine.
Any ideas as to what might cause it.

Some images showing the issue, both had identical settings only difference was supports.
The last image shows how at the end of the print, when there were no supports needed it printed fine.

Any help would be greatly appreciated, thanks.