15 Coolermaster JetFlos??? That thing must sound like a vacuum cleaner on steroids!
My pc is loud as well… but it only runs 2 JetFlos, 2 SickleFlos, and 5 stock Coolermaster case fans.  Have a listen to mine… I fire it up at about 04:46 into the vid.  https://www.youtube.com/watch?v=nYsHEcQnMgU  It’s not as loud when I remove the DDR3 cooler… those little fans spin at something crazy high like 8000 rpm.