Sick. Your temps are amazingly low :\. But do you have those Noctuas smashing through air? Running at 2k RPM? My bottom fans in mine are 800 rpm noiseblockers, my D9L runs 2 92mm fans at 800-1500rpm variable, and the rear fan of the same type at 1000rpm. No intake on the side. Is the side intake perhaps your key to low temps (short of the delid).Finally finished up my M1 build. Got all my parts in except the Toxic cable because of the 8-10 week wait. NBD.
The Struggle
Full parts list can be found here:
Shottielol's Completed Build - Core i7-4790K 4.0GHz Quad-Core, GeForce GTX 1080 8GB FTW Gaming ACX 3.0 - PCPartPicker