This solved the problem.
Strange enough: the Y offset was correct at 75 mm. Just the X offset was 152 mm and should have been 115 mm.
I guess they needed to be changed to take effect.
I am having exactly the same problem. The printer is a CTC creator dual. It's a direct clone of the FlashForge Creator Dual. I tried the 'CTC 3D printer' and the 'FlashForge Creator Dual' profiles and the problem is exactly the same: 1. For heating up the extruders part in the center of the plattfor...