So from what I read what you have right now is this:

A: 59, 60
B: 59 (no grants), 60 (grants)
C: 59 (no grants), 60 (grants)
D: 59( no grants), 30 (grants)

So what I would recommend is this: create a new trio on A, B and C and level to 15. Grant D:30 to the C:15 to get to 30. Then, grant C:30 to B:15 to get to 30. Then grant B:60 to A:15 to get to 45. Then grant B:30 to A:45 to get to 60. Then pay $25 to transfer the new level 60 on A to account D.

Costs $25 but otherwise is easy peasy.