Can you suggest a kernel for full AMD rigs? It seems that autotune always select kernel 0.
It used to be higher. We tried to improve it, but it keeps coming back.
The hiveon pool have 0% fee, so even with 0.5% rejected you should get more shares than on the other pools you listed. The hiveon pool is using the ETHPROXY protocol and different code in the miner than the 2miners and crazypool.
Hiveon has a higher share per minute rate compared to other pools, it seems TBM is not able to run 100% stable at that quicker rhythm. Probably is not fully integrated with ETHPROXY protocol but rejected are possible with other miners too because of that difference, despite being very rare. Did you try to optimize the code to speed things up during mining? I suspect it goes kind of "out of sync" at times