I chose 7/4,24/23  after some deliberation. My goal was to win, and in order to do that, I need to keep my opponent on the bar, so the board has to be made. The last ace is just to get to the edge of the prime.
1.  Rollout^{1}  24/23 7/4  eq: 0.006 
 Player: Opponent:  49.72% (G:10.69% B:1.25%) 50.28% (G:26.07% B:2.73%)  Conf.: ± 0.005 (0.011...0.000)  [100.0%] Duration: 1 minute 41 seconds 

2.  Rollout^{1}  24/23(2) 11/10 8/7  eq: 0.033 (0.028) 
 Player: Opponent:  48.34% (G:7.80% B:0.33%) 51.66% (G:31.59% B:6.70%)  Conf.: ± 0.005 (0.038...0.028)  [0.0%] Duration: 2 minutes 10 seconds 

3.  Rollout^{1}  24/23(2) 13/12 8/7  eq: 0.044 (0.038) 
 Player: Opponent:  47.81% (G:7.82% B:0.35%) 52.19% (G:33.03% B:8.79%)  Conf.: ± 0.006 (0.049...0.038)  [0.0%] Duration: 2 minutes 04 seconds 

4.  Rollout^{1}  24/23(2) 8/7 5/4  eq: 0.068 (0.062) 
 Player: Opponent:  46.60% (G:7.38% B:0.43%) 53.40% (G:33.26% B:7.36%)  Conf.: ± 0.005 (0.073...0.063)  [0.0%] Duration: 2 minutes 01 second 

5.  Rollout^{1}  24/23(2) 13/12 5/4  eq: 0.071 (0.065) 
 Player: Opponent:  46.47% (G:7.35% B:0.46%) 53.53% (G:34.45% B:9.30%)  Conf.: ± 0.005 (0.076...0.065)  [0.0%] Duration: 1 minute 53 seconds 


^{1} 1296 Games rolled with Variance Reduction. Dice Seed: 74648402 Moves: 3ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10, MET: Kazaross XG2