XS 57's? I always thought those were supposed to be a great mid/ MB driver, and which MB speaker are you putting in?
Still staying with the XS series. They are great sounding speakers but I had persistent issues with loose tinsel leads "razzing" on the bottom of the cone. I asked if I could get 6.5" mids rather than replacement 5x7's...
New mids... WoofersEtc.com - X-65 - Image Dynamics 6.5" High Definition Mid-Bass Speakers
And I'm going to try these... 6 1 2 Speaker Universal Pod Mount Custom Kick Pods Car Enclosure 6 5" Must See | eBay
And blend them into the door panel so that they fire more up into the car and not at the trans