by "self-trade" I mean trading against yourself regardless of if it is the same account or not. That is why I suggest coinage. Using that it wont matter how many accounts are used.
I posted several possible solutions:
https://steemit.com/trading/@jl777/usd100-000-per-day-ongoing-drainage-of-liquidity-rewards
also I am rejected when I try to join the slack, "token revoked" or something error like that
There is no coinage literally since it is an account based system, not outputs, but maybe something like average coin age could be maintained for an account, or minimum, or something. I haven't thought it through. Reasonable direction though.
No idea what's going on with slack. Maybe try a different email or different browser?