Fiberglass Question

I'm trying to get the body adjusted on my car (fiberglass kit car) and feel like I have taken it as far as it can go with adjustment. Most of the panels fit ok and the gaps are pretty good (for the most part), but there are places where the contours of the panels don't quite match up. Kind of like some of the aftermarket replacement fenders for regular cars.

These mismatches are around 1/16", but a couple are about 1/8". I'm wondering what the best way to get these contours leveled up is? Can I just lay on some high quality filler or should I raise the low spots with a fiberglass based product (like Kitty Hair) and then cover with gel coat? Or is there something else I should do?

I hope Shine will chime in, because I know he has done several Corvette restorations and I'm sure this issue is something he has dealt with.