Overall I like the straight scan as much as the split grade versions. While the last split grade version has real possibilities to be slightly better than the straight scan it might, as tkamiya has sa,d, need flashing to tone down the arms which are hot.
However have you tried to alter the grade by half a grade divisions at a time. You might find that there is a half grade increase and a slightly different exposure setting that gets you very close to the split grade version without flashing.
As you are experimenting anyway then this might be a worthwhile exercise.
I might of course not be a punchy print afficionado compared to those who have commented in the exchange. The straight scan is far from flat or grey in my opinion.