.. I know Bandais plastics are weird about thinners, so grain of salt here:
get a really thin mix of your primary hull colour [like 95% thinner], and spray that over the whole model like a clearcoat, but go extremely light.
this will act as a filter and "unify" or "blend" the colours of the model... there's a proper model-building term for said process, but it escapes me at the moment... They'll pop less without actually darkening them.
another option that would darken [the whole ship, not just the decals] would be the above process using "Tamiya smoke" or something similar.
PS: also, it looks like you havn't done the requisite "make it look like the piece of junk Luke said it was" weathering that the falcon typically gets... weather it and see if they're still popping too much for you.
If you use products like Flory's washes, then you can kill two mynocks with one procedure... it will act as a filter just by the nature of the stuff and how you use it.