your idea on how the 'damage transferal' is spread is good. However, it gets a little complicated when u go further into the paragraph though. BUT thats the problem, it just has too many changes at so many stages in minion growth rate.
Ill use your idea of the 'damage transferal' and incorporate into my idea.
According to different generals, damage transferal should work differently. Keeping them unique.
eg 1. the vampire general - to restore dmg dealt to him, make it so he is able to suck hp from minions in range at a rapid rate but also at the cost of mana. (dont know the characters but ive heard of the vampire guy). This could possibly be a toggle buff (turn on, turn off).
eg 2. queen of thorns (im guessing if the one that stands on the plant) - Her and the minions or just minions become immobilised. Queen sucks health from minions with her roots, minions take 80% less damage during this time.
its not really dmg transferal, but it shows the interation between the general and the minions which you're trying to show, i think.