Seeing anybody walk away with two numbers or less should be a once-or-twice-a-season event.
I'm not going to go this far - but here's the split when Roger was there in S35 and S36:
3 free numbers: 61%
2 free numbers: 21%
1 free number: 14%
0 free numbers: 4%
And here's the split ever since then:
3 free numbers: 18%
2 free numbers: 39%
1 free number: 31%
0 free numbers: 12%
The thing is, even with the Roger split, contestants still lost more often than they won (it went 11-17). So they shouldn't be so afraid to offer up 3 free numbers, because odds are good contestants will misuse them or still have a tricky choice to make with the 2 numbers remaining.
Shift the losses to other games until Stack the Deck regularly gets about a 50-50 win ratio.
This seems unrealistic since almost no car game is this high. Since S29, the only car game above .500 is Hole in One.
(Special thanks, as always, to Scorpz.)