The fastest publicly available X-algo miner for AMD GPUs is most probably badman74's modded sgminer-v5 (get it here https://www.nicehash.com/software/#sgminer) ... some additional optimizations of various CL kernels were done by various individuals, but weren't publicly released. And you can get some decent income if you point it to NiceHash multi-algo service https://www.nicehash.com/multialgo.