Add to what you wrote the fact that the stats will be skewed by a pool doing manual trades; if H20 trades for a really good payout then the day after all of the clients on the auto-switcher will switch to that pool.

Afterwards, a whole day (maybe even two) will be wasted on poor auto-payout days after the big manual payout.

The pool autoswitching is not a bad idea; whoever writes it will need to keep all of this in mind.