My suggestion to boost 9 toons to 60/61 with RAF with just one transfer:

A - main account (non linked booster)
B -> C -> D -> E -> F -> G -> H -> I -> J (9 chained RAF accounts, B invites C, C invites D, ... )

1. instance boost CDEF to 31.99
2. instance boost GHIJ to 31.99
3. continue boost IJ to 59.99
4. ding J to 60
5. level together another 2 toons on accounts I and J to 3.99
6. grant 1 level from lvl60 J -> lvl59 on I (becomes 60.99)
7. grant 28 levels from lvl60 J -> lvl3 on I (31.99)
8. transfer lvl31 from I -> B
9. chain grant 29 levels I -> H -> G -> F -> E -> D -> C -> B
10. ding BCDEFGHI to new levels
11. you got now 1x80,8x61,1x60