Did one one in hell mp10 for kicks and giggles trying to mimic previous runs with 200% exp bonus the result was closer than I would have guess about 14% exp for dual inferno and and 6% exp for the hell single run. My exp bonus in inferno was 120 with 5nv and it was 300% total in hell with 5nv.
Could hell act 3 using popular run be more efficient than inferno act 1? Perhaps I should try act 4 hell where monster level exp penalty may not be as prevalent?
Btw I am pl 28