preshading

try going back with a thinner cup of the RLM 76 and building up the interior of the panels with that color.. your first pass will be all over the surface you are spraying, subsequent passes will fill in the interior of the panel while leaving the panel lines "just shaded enough"... and that is your call on how much is "just shaded enough"  it usually takes a couple of passes to get it both uniform and still see the panel lines a bit...  If the panel lines look too dark you can go over them once or so with the thinned RLM76...