Regarding open world Heavy

[Kiokin]

I do them all the time, I still don't see your issue, I can avoid pretty much all agro if I actually use my eyes and survey my suroundings instead of burying my head into my map display.

the few Sylphs that are hard to avoid agro can also be easilly outrun long before you get the heavy debuff, it's not the first hit that applies the debuff.

Sometimes it is the first hit. That's the problem.