Just spitballing here, but they could take a page from the 70s nighttime version and if they just can't do a tiebreaker they could let the two contestants play the winner's circle and split the proceeds. Given that the players are giving the clues I bet they'd be OK with this as a choice.
If they're not going to do that, at least be more transparent about how they get to the results. "Wow, you had nine seconds left over, so we'll give you $100 per second saved and put $900 in your bank," and update that every time a team goes 7 for 7.