I'll try 13-7. My reasoning is that when we get hit we're going to tend to get doubled-out very quickly a lot of the time so I want to make the play that lets me make the most progress when I'm missed. His guy on the ace makes it really hard to play safely in the future after stacking up on the 8.

1. XG Roller+ 8/7 6/1* eq:-0.149
Player: 47.96% (G:7.38% B:0.30%)
Opponent: 52.04% (G:18.99% B:0.53%)

2. XG Roller+ 9/8 9/4 eq:-0.198 (-0.049)
Player: 46.76% (G:6.27% B:0.17%)
Opponent: 53.24% (G:17.02% B:0.25%)

3. XG Roller+ 13/8 9/8 eq:-0.221 (-0.072)
Player: 45.53% (G:6.91% B:0.28%)
Opponent: 54.47% (G:18.30% B:0.34%)

4. XG Roller+ 8/2 eq:-0.250 (-0.101)
Player: 45.75% (G:6.00% B:0.18%)
Opponent: 54.25% (G:18.70% B:0.31%)

5. XG Roller+ 13/7 eq:-0.265 (-0.116)
Player: 44.94% (G:7.23% B:0.32%)
Opponent: 55.06% (G:17.94% B:0.33%)