Congratulations on your project! Always nice to have a feeling of accomplishment. On your midrange, not what you wanna hear, but I think you would be much happier with the R13 in there on three sides, if you can get your wife to try it. I have the regular 2Pi's, with a smaller port, but have never had any problems with it coming out. You can use spray adhesive to hold it in, it's really not a big deal to install but it does smooth out the midrange to one of the speakers strong points. I personally don't think that egg crate stuff does anything, just my opinion. Somethings worth doing, etc.p.s. I've removed & installed installation in hot attic, so if anyone has a complex about it, I do. My son installed it in the Pi's :)