You have an absinthe.  You have a gallery.  If you drink the absinthe,
you have two choices: you can do 5-1 leveling, or you can just do "1".

Suppose the gallery gives an average of 75 muscle per turn.
Suppose 5-1 leveling gives you an average of 84 muscle per turn and takes 2.5
  turns expected.
Suppose "1" leveling (the last turn only) gives 100 muscle.

We have 10 turns to spend.
If we spend 10 turns in the gallery (don't drink the absinthe) we get
  750 muscle.
If we do 5-1 leveling, we spend 7.5 turns in the gallery and 2.5 turns in
  the Worm Wood.  We get 562.5 muscle from the gallery and 210 muscle
  from the Worm Wood for a total of 772.5 muscle.
If we do "1" leveling, we spend 9 turns in the gallery (675 muscle) and
  1 turn in the Worm Wood for 100 muscle.  Total 775 muscle.