If you want the best settings/tweaks for your GPU, there is only one way to reach that, Experimentation.
These are the threads, I'll definitely recommend reading and gaining knowledge from it regarding RX GPUs.
https://bitcointalk.org/index.php?topic=1954245.0https://bitcointalk.org/index.php?topic=1891461.0https://bitcointalk.org/index.php?topic=1874892.0Tips for the same:
. Samsung can reach the highest memory OC, so if you are lucky enough to get Samsung memory vendor in your card. OC it for the best possible hashrate.
. Claymore miner is amazing, use it together with rxboost.
. Overclock Memory, Underclock Core, undervolt voltages to maximize hashrate with lowest power consumption.
. Stability is important than +2% increase in hashrate. Once you find a sweet spot, always keep it a little below then the sweet spot for stability.