[And again:] ... and we are not able to speed-up ours any further. Which is not the case.
Not entirely sure what that's suppose to mean. What I do know is that, this miner is dead. The latest XPM miner is shelling out 4.9 CPD on a 280x at 1100.

. Even if this miner gets open sourced, nobody would use it. The fee-free version of the miner is shelling out 3.9 at 1100.