Hi Vquestor,
unfortunately it's drum mapping I think, that is causing the biggest hassle.
The psr styles have drums in their kits that go beyond the gm standard ie they've got brush drums in most of their kits, wheras gm only has brushes in the brush kit.
ie in a psr Standard Kit you have brushes& snaredrums wheras, in a GM Kit, you'd have to use the brush kit to get the brush sounds, but you end up losing the snares.
That's just one example of a trade off.

It would be great to be able to put together a good quality xg mapped drum soundfont.
Better still, would be if one of the softsynth companies had an xg mapped drum set.

best wishes
Rikki