Z-PETG raft separation problems M200 vs M300

I am printing face shield parts for 3Dcrowd. I am using Z-PETG on an M200 and an M300. The settings were identical for both .zcodes. The M300 prints separate from the raft perfectly, but the M200 prints are really difficult to get off the raft. I have increased the first layer gap to 0.44 but this seems to make no different. I am using the standard hot end V2 with micro-swiss nozzles