Ok That's better I know not really but we have ruled out power. The issue comes down to the E682. The first year I ran one the max I could get from the controller was 15 feet with strips and 20 feet with bullets if it was even that. That's was with all solider joints, no connectors I fixed mine by giving it away and going with a F16v2 and never looked back. Even with my F16v2 and 14-3 speaker wire the max is 37 feet. I did test Cat5 and it will go 60 feet but you are not pushing power down that, and if you do, the power will mess up the data. The other choice you have is changing out the resistors on the board. If you do a search others have talked to what to change to. That I cant help you with. Now that I recall I had split my power away from my data to get the 15 feet on strips.
As of now 2 choices F16v3 or new resistors. One other test that I never did is leave your power alone take a cat5 cable 40 feet with Data and ground only , One twisted pair see what it does on your E682. I did this with f16v2 and started with 100 feet kept backing it down until it worked. 60 feet.
I know I have not given a straight up answer, wish I could, at least some directions to head.