Set your bluray to large for all speakers in the bluray and let the 990 do the work. If you mirror your 990 settings in the bluray then you are actually stacking the crossover filters and your 3 dB point will now become a 6 dB point. Then when the 990 does bass managment you'll end up with a 3 dB dip at the crossover frequency.

Truthfully, my room inserts bigger dips and peaks in that frequency range but adjusting the cross over is easy and at least takes that error source out of the equation.