Running great one day and next it stalls every time I hit the gas too hard

Well, I can't see it being timing; My Idle-Timing is also set to 14*. But I can vary that Idle-Timing from the cab, with my dash-mounted dial-back timing retard box, any where from 5* to 20*, without touching the carb. And I have never experienced a bog, anywhere in that range.
IF
the bog occurs from some pedal-smash, not from idle, then some to all of your primary pumpshot may already have been used up.
Perhaps
the bog is occurring when the secondaries open, and the back bowl is NOT full, or more likely; the rear pump is faulty. Maybe the link-rod fell out.