polk db650 where to set crossover?

head unit : alpine 9855

amp: jl 500/5

subs: 2 x 8w3v2

i have polk db650 coaxials in all four doors, where should i cross the speakers?

the fronts are gettin 100 x 2rms, and the rears are getting 25 x 2rms, the sub is crossed at 85

currently, i have the speakers crossed at 100 @ 6db octave (the midbass is somewhat gone even just 6db oct)

when the eq is "flat", the highs are somewhat muffled, and when the eq is set at "country", the highs are too bright

should i even crossed the speakers? they sound more natural not crossed