Mine creaks also, taken apart and cleaned/regreased several but still the same....weird thing is it only really does it when you're off the seat and climbing moderate slopes, steep ones its only a faint creak?
I bought the diacompe one. Fitted it but it’s not that stable and moves around too much. Also needed quite a long thread and long rear brakes. Ended up returning it all and drilling the frame instead
Did you end up running discs on the front? hows it handle?
I'm running GP4000's also in the 28mm, but theres about 1mm clearance between the tyre and the bottom of the fork so it rubs sometimes....looking at your pic above there seems to be loads of space?
I wasn't aware these were user serviceable like the White Industries ones?
I've tried cleaning best I can but probably does need to come off for a deep clean