1 Minute answer --- you can cover BR3 high and low without exposing yourself to losing while he pushes by betting 1625 (assuming betting increments of 25 and using the rule of thumb to bet as much as possible while still taking the low). In order to to cover BR2 high and low, you need to expose yourself to the 1/2 swing which was avoided above (bet would be 125). Going big also covers naturals by both opponents where going small only covers BR2's natural. Both bets allow you to double/split for an advancing position if necessary.
It looks like going big to cover BR3 has the edge. Bet 1625.
I don't have my copy of Wong handy, but this smells like one of the examples where you take second low automatically, but only if its 2 advancing out of 3.