What about with a 10% threshold and/or 2 EVs to the state winner?
I thought it was interesting that under the most proportional system short of a national popular vote, Trump still manages to obtain a plurality (and presumably win the election in the House). Presumably any other modification would give Trump even more of an advantage.
10% threshold:
Clinton 270 Trump 267 McMullin 1 (I stand corrected)
2 EVs to state winner:
Trump 267 Clinton 259 Johnson 10 Stein 1 McMullin 1Both:
Trump 272 Clinton 265 McMullin 1Surplus to state winner:
Clinton 268 Trump 266 Johnson 2 Stein 1 McMullin 1 ("" "")