After running it load all night here are the temps.
The Maze 4 results were:
Air: 26C
Water: 30C
TC: 43C
Onboard: 40C
Lemon Block Cu:
Air: 27C
Water: 31.1
TC: 39C
Onboard: 37.5C
Considering the air and water temp are 1C higher than when I tested the Maze 4 I would say it is doing very well.
BlackEagle: Flow rate is excellent but I have no way of testing it right now. Can't even do a bucket test at the moment. I got the Hydrothruster 500GPH at full speed (as I did also with the Maze 4) and the pump is not stressed a bit. Next time I tear everything apart I can drag it all in the bathroom and do a bucket test. The Aluminum Lemon Block is currently hooked up to a 200GPH submersed chepo pump which usually has a hard time but it is near freee flowing through it. Just from the eye I can't see much difference. I would imagine the Aluminum one would be a little less restrictive because of deeper channels but the barbs are narrower to so I don't know. I went with the bell type connectors as they give a true 1/2ID as to where the brass barbs are no where near it even though they say they are 1/2ID.
As for the modifications I will keep that in mind. It will be a while before I can do any more messing around with this stuff again. Life is catching back up in a hurry.