So where do you set the difficulty, looked and can't see the setting.
There are two difficulties
1 pool worker difficulty. When you set this in your pool web interface not tplink to 64 or 256 or whatever is appropriate for your hash rate you will reduce pool rejects on startup. I am not mentioning the fact that your hash rate may be between two difficulties from pool point of view. So if pool changes your difficulty up and down it will affect your paid /accepted shares in long term. Some of them will be ejected or so e of them will not be submitted at all. We are talking for milliseconds here but all counts
2. Dev difficulty on hexbe200 and hex8a boards. This tell to asics to return only shares matching or above pool difficulty
Pross
Less USB load
Cons
Harder for software to spot and reset asic if needed because of the variation. A chip may not return a single valid share for minutes due to diff even though it is working fine we call that bad luck
Resume
In the beginning just setup your pool difficulty and spent a couple of minutes watching if it has been changed
If yes wait a little bit to settle and increase or decrease it.
most of the pools do have some predefined startup values to be chosen based on your estimated hash rate. If your hash rate is higher then they increase the difficulty but not opposite they never decease it Just watch it and if you happen to be in between act accordingly and in erase it.
If you set it too high now worries you will not see accepted shares flowing so quickly and your pool graph will vary but there is nothing to worry about you will get used to it