QUOTE(Ezekyle @ Mar 29 2018, 20:17)

After spending hours on 20-round IW runs on disposable gear and only getting one or two spelling errors, I took a risk and played on a 70-round Magnificent Power Helmet. There was a major difference.
Results:
1x Aggravating, 2x Exasperating
Capacitors 1 and 2
I'm starting to suspect that the quality of the equipment piece has an effect on spelling error drop rates.
Another problem that could color your results is the fact that the first 10-15 rounds of an item world only have a handful of enemies, while after that it's always 6-10. More rounds with 6-10 enemies, more drops, and more spelling error goodness.