Ok, your oscilloscope shots speak by themselves.
The JPAC combines syncs but it does not invert them, so definitely the video card is outputting composite sync (you can double check it by probing the H-sync pin of the VGA output). That's odd because, by default, VMMaker always creates negative syncs unless you configure it for positive polarities.
It might be happening due to a version mismatch, between Emudriver & tools. AMD has changed the related flags several times so that part of the software is a bit of a mess and somewhat based on heuristics.
So before inverting the syncs by means of the crt_range definition, my advice is to reinstall the driver, making sure you pick the newest version, not the one based on 12.6 (as it's shown in your screenshots some posts above).
That might alone solve the issue. It not, play with the polarity flags in the crt_range line (they can either be 0 or 1) and re-create the modes.