Proportional electors seems insane.
Like...Nevada will go 3-3 every election ever, effectively cancelling its vote out. Wyoming would be a tight race between 2-1 R-D or 3-0 R-D, so it might get more attention than Wyoming does.
The only states with enough EVs that the number of EVs a candidate gets would shift by more than 1 either way are the states with over 10 EVs, and maybe even the ones with over 15 EVs.
It'd also still end up with wildly disproportional outcomes, too. Third Party candidates got 6% of the vote in 2016. Under this proportional EV system, they'd get 4 EVs total. (2 for Johnson, 1 each for McMullin and Stein)
Either give states 10 electors per House district, or allow electoral vote counts to go out 1 or 2 decimals, and then it's not an issue anymore.
Any move towards a proportional system like that increases the number of electors going to 3rd party candidates, which means a high probability of no one winning a majority of electors. So then the presidency is decided by the House, or perhaps worse, by faithless electors cutting deals with each other.