The other day I enjoyed hitting a first checker in a 'coup classique' position. Though I succeeded in eventually closing out both checkers and winning after a recipe, there were a lot of plays where I wasn't sure what I should be trying to do, so I thought it would be worthwhile spending some time playing it out repeatedly as a 'Deliberate Practice' exercise.
Right away, though, as I started cycling through the 21 dice rolls for the opening position, I found the evaluation depth for some of the likely plays were so low that the results were way off. With an initial 23 for example, it buries 13/8 way down in 10th place, while if you roll out both plays you get 13/8 beating out 8/5 6/4 by .013.
Okay . . so I get that XG tends to be unreliable in back game / lopsided containment positions. But then, when I tried "Play from Position" in Coaching Mode with "Champion" as my opponent, XG promptly affirms that 13/8 is the right play (see second position below)  via a '+' level evaluation. (Though I'm still thinking just making the 8pt should be right by a larger margin?). It also quickly picks 13/8 if I use "++ Roller" as opponent.
So, my question is
a) If I want to go through all 21 rolls in this position, what's the most efficient and reliable way for me to go about it?
and
b) If I practice playing out this position on, say 'Champion' level, can I be confident I'm getting good guidance from XG in 'Coaching' mode?
Any help appreciated.
Evaluating a 23 in "++" mode:
  White is Player 2
score: 0 pip: 25  Unlimited Game Jacoby Beaver  pip: 175 score: 0
Blue is Player 1  
XGID=aBBCABABAaA:1:1:1:32:0:0:3:0:10 
Blue to play 32 
1.  XG Roller++  8/5 6/4  eq: 0.243 
 Player: Opponent:  47.48% (G:0.00% B:0.00%) 52.52% (G:23.00% B:13.01%)  

2.  XG Roller++  19/16 8/6  eq: 0.276 (0.033) 
 Player: Opponent:  46.71% (G:0.00% B:0.00%) 53.29% (G:24.08% B:13.42%)  

3.  XG Roller++  20/17 8/6  eq: 0.290 (0.047) 
 Player: Opponent:  46.15% (G:0.00% B:0.00%) 53.85% (G:24.40% B:13.21%)  

4.  XG Roller++  22/20 8/5  eq: 0.329 (0.086) 
 Player: Opponent:  45.32% (G:0.00% B:0.00%) 54.68% (G:25.16% B:14.35%)  

5.  4ply  19/17 8/5  eq: 0.399 (0.156) 
 Player: Opponent:  43.07% (G:0.00% B:0.00%) 56.93% (G:25.19% B:16.02%)  

6.  4ply  22/19 8/6  eq: 0.466 (0.223) 
 Player: Opponent:  42.51% (G:0.00% B:0.00%) 57.49% (G:28.40% B:18.25%)  

7.  3ply  20/18 8/5  eq: 0.400 (0.157) 
 Player: Opponent:  42.67% (G:0.00% B:0.00%) 57.33% (G:24.62% B:15.72%)  

8.  2ply  20/17 19/17  eq: 0.598 (0.355) 
 Player: Opponent:  37.27% (G:0.00% B:0.00%) 62.73% (G:29.52% B:17.99%)  

9.  2ply  13/10 8/6  eq: 0.601 (0.358) 
 Player: Opponent:  39.32% (G:0.00% B:0.00%) 60.68% (G:29.87% B:22.73%)  

10.  2ply  13/8  eq: 0.622 (0.379) 
 Player: Opponent:  38.07% (G:0.00% B:0.00%) 61.93% (G:29.61% B:22.13%)  

eXtreme Gammon Version: 2.10
Playing from Position on "Champion" level opponent:
  White is Champion
score: 0 pip: 25  Unlimited Game Jacoby Beaver  pip: 175 score: 0
Blue is Player 1  
XGID=aBBCABABAaA:1:1:1:32:0:0:3:0:10 
Blue to play 32 
1.  XG Roller++  20/17 8/6  eq: 0.290 
 Player: Opponent:  46.15% (G:0.00% B:0.00%) 53.85% (G:24.40% B:13.21%)  

2.  XG Roller++  22/20 8/5  eq: 0.329 (0.039) 
 Player: Opponent:  45.32% (G:0.00% B:0.00%) 54.68% (G:25.16% B:14.35%)  

3.  XG Roller+  13/8  eq: 0.188 (+0.102) 
 Player: Opponent:  49.30% (G:0.00% B:0.00%) 50.70% (G:21.29% B:13.47%)  

4.  XG Roller+  8/5 6/4  eq: 0.205 (+0.086) 
 Player: Opponent:  48.96% (G:0.00% B:0.00%) 51.04% (G:23.47% B:12.17%)  

5.  XG Roller+  19/16 8/6  eq: 0.224 (+0.066) 
 Player: Opponent:  48.63% (G:0.00% B:0.00%) 51.37% (G:23.54% B:13.25%)  

eXtreme Gammon Version: 2.10