R22 and 5/8" liquid line is good for nominal 60 metre pipe run. the penalty is condensing temp and vertical separation plus length losses, possible flashing off in liquid line pre TXValve with natural sub cooling and pressure drop, Txvalve could be hunting and irratic operation A sight glass at the TXV would confirm or not, sounds stupid but insulate the liquid line to maintain constant liquid feed to TXValve, the flash gas after txv will be high but you will get stable TXV superheat control