Improves PE and IC
Hi/Lo has both a mediocre PE and IC since, for playing and insurance purposes, the ace should not be counted as negative.
If you adjust the TC by adding 1.5 for each excess ace played you'll effectively be counting the ace as +0.5 for playing purposes and then PE rises from...
HO2 is still better
The BC for 0 1 1 2 2 2 0 0 0 -2 with an ace side count is .971 while the PE is .632.
The BC for 0 0 1 2 2 2 1 0 0 -2 with an ace side count is .658 while the PE
is .658
HO2 is better in both regards with a BC of .982 and a PE of .668. I don't see why these counts are any...