I was worried you wouldn't be happy with performance. Not having a center inlet can affect temps quite a bit and I have a feeling your base was just way too thick. You want as little material as possible between the water and the cpu heat-spreader, but I can't tell from the pics just how thick your block is. I think I settled on ~2mm for my base but I'm sure it's possible go with a lot less. And more surface area always helps so more/thinner fins. At least for your test block, 76C on a 4.4ghz 5960x isn't that bad considering how much heat you have to deal with. I think most blocks on the market wouldn't be able to do much better than ~70C or so. I wish I had a beast like that to test my block on.