I have been doing the same thing you do for months, just trying to make 2.5%/day. I know what you mean. Whales tend to research million dollar decisions from what I know of them, and I am sure they would research why NBT is at .89 before investing, and I am guessing they know the normal range it trades and would certainly be curious to know that the reserves are empty and that is why the normal range has been breached.
This problem stems ultimately from the nature of how the Nubits teams uses their funds. Instead of putting up walls, they should have a bot capitalizing on other orders that are out of line, and immediately turning their funds into tether. Holding their funds in 100+ BTC is death in a bear market for them, and yes, they could keep the peg, but lose millions of dollars, instead of keeping the peg and making millions. Very stupid