Auto-Exchange balances are paid to miners daily around 9pm EST to those miners with a minimum of 0.01BTC. Balances
0.00998523 BTC its under 0.01 and the exchange do not accept lower than 0.01. thats it.
TMB does lower payouts once in awhile. The Exchange has has nothing to do with it. Lots of pools do payouts at 0.001.