Getting the impression that nobody believes it could be the compressor under pumping except me...
Ok so far
-checked gas charge reclaimed and weighed correct amount back in so not gas issue.
-checked capacity of indoors to outdoor including liquid pipe length all ok.
-checked test heating and cooling, only obtained 30 degrees coil temp in heating and 10 degrees in cooling. Which in heating was 16 bar high pressure and 9 bar low pressure
-closed gas stop valve in test heating and pressure only rose to 25 bar and Amps rose from 5 Amps to 7 Amps, if compressor was running normally it would achieve 30 Bar in heating HP with gas stop valve open and then if it was closed would shoot up to 40 bar + which would then trip out the HP safety
-checked resistance of 4 way valve and bypass soleniod and both were around 1.4 kohms which is within range
-closed liquid line with unit in test cooling to try and pump unit down, unable to pump down as compressor was under pumping

Pretty sure i have covered everything now