I am at loss in trying to understand why 6/5 6/4* is a .085 blunder here. It is 5.5% better for the win, a little better for the gammon, and only a trivial .4% worse for the gammon loss. Can someone more mathematically inclined than I explain this to me?
Thanks in advance.

              
 
              
 | | White is Player 2
score: 0 pip: 47 | Unlimited Game Beaver | pip: 85 score: 0
Blue is Player 1 | |
XGID=--BBaBDC--B-----------ddf-:1:1:1:21:0:0:2:0:10 |
Blue to play 21 |
1. | XG Roller++ | 6/4* 4/3 | eq: +0.799 |
| Player: Opponent: | 71.66% (G:2.03% B:0.03%) 28.34% (G:1.12% B:0.00%) | |
|
2. | XG Roller++ | 6/5 6/4* | eq: +0.714 (-0.085) |
| Player: Opponent: | 77.23% (G:2.79% B:0.04%) 22.77% (G:1.51% B:0.00%) | |
|
3. | XG Roller++ | 7/4* | eq: +0.709 (-0.090) |
| Player: Opponent: | 76.22% (G:2.77% B:0.04%) 23.78% (G:1.73% B:0.00%) | |
|
4. | XG Roller++ | 6/4* 5/4 | eq: +0.617 (-0.182) |
| Player: Opponent: | 71.57% (G:2.51% B:0.03%) 28.43% (G:1.20% B:0.00%) | |
|
5. | XG Roller++ | 10/9 6/4* | eq: +0.583 (-0.216) |
| Player: Opponent: | 76.21% (G:2.79% B:0.04%) 23.79% (G:5.58% B:0.01%) | |
|
eXtreme Gammon Version: 2.10