I have 6 Antminer s9 mining on slushpool with an average of 82 Th/s, I have set my "minimum difficulty" to "14848".
Is that the "best" setting? what happens if set the difficult low or very high ?
THANKS
The "best" setting is just to let the pool manage the difficulty, so set it to 128/Auto the pool will then adjust the difficulty depending on the share return rate of the miner in question.
You only need to tweak it if your miners are showing lower hash rates than expected. There is an explanation here: https://slushpool.com/help/first-aid/troubleshooting
Leave it at auto, wait for a day and see what your average hash rate has been for each miner, if its as expected then don't worry. You won't make enough of a difference to waste time over.