Leading bid quoted below with 30min left:
COUNTDOWN TIMER0.17 BTC
Just figured out I made a typo in the sniping rule, which is now corrected in the op:
SNIPE:
Any bid made in last 15 minutes will extend the auction 20 minutes beyond end time until no new bids are made.Any bid made in last 20 minutes will extend the auction 20 minutes beyond end time until no new bids are made.