I have TR brakes myself since 2010 and they have been great, just up graded my pads to TNN this week. As for the slow retract I would check the brake pad interface. I filed the sides of the square bit on the middle as it was tight on the slaves. After that it was fine and works great. This week when I got my TNN CNC pads I had to file the aluminum backing again to fit, it was way too tight I can't even get it on the slaves. After a few minutes of careful filing to fit , it now works on the TR brakes.
Regarding the Ecko disk brakes, you don't have to open that orange dial thing. It seals the whole system after them installing the pistons. You need the tool is your actually rebuilding them with new piston rings which I highly doubt you have to do for a long time. Just bleed them like any other disc brakes. To me they seem to be a copy of the Hope disc brakes.