Help with components

I need some help with components. I recently purchased a 2013 RAV4 and wanted to upgrade the sound system. I installed a set of kenwood 709 components starting with my front stage. These have decent sound, but not much cleaner than the factory speakers. I then installed a clarion xc1410 amp and a set of morel Maximo's. These are very detailed and I can hear details in music that I typically can not hear. The issue I am having..... The tweeters are mounted in the factory dash locations and fire up at the windshield. There is no attenuation at the crossover and my ears are fatigued. I built an L-pad and tuned down the highs, however feel I am loosing some of the mix and the tweets are still too bright. I am considering a set of jbl p660c and attenuating the tweet at -6db. Does anyone have experience with the p660c's in a dash install? Any thoughts would be greatly appreciated.