I agree that finding an absolutely fair electoral system is a difficult task. Also agree that for a federation some measures should be undertaken to avoid dominance of big members over small ones.
However, in this case The Equality is sacrificed.
I was curious how many "heads" are served by a single college voter in different states and looked into the records (I rounded the numbers).
4 most populated states: CA - 720K (i.e. 1 elector represents c.a. 720 000 people), TX - 770K, FL - 680K, NY - 680K.
Some small states: WY - 200K, MT - 300K, NM - 400K.
Thus, on a personal level a question may arise why the vote of an elk hunter in Jackson Hole (Wyoming) has 3.5 times more weight than a vote of an airospace engineer in Pasadena (Ca)? I respect both... Or, why a farmer in Texas "costs" only half of his neighbor in New Mexico?
No sarcasm, just my thinking outloud....