I've been talking to heroes who have been killing bigfoot just fine without PG or stance. Maybe one of them can chime in @Seb
wat. That's one of the fastest ways to level up besides HT, even faster if you have no issues finding them.
I must say i'm killing all the bigfoots with my hero while my bm is standing behind me spamming hurricane and the Phoenix skill up, so i don't get hit by any mobs. So basically i don't need Stance since i'm not getting hit by the wraiths or elder wraiths anyways. Before i used my bm to kill the mobs, i was doing just fine without stance or powerguard. PG isn't even needed for a hero since most hero's will have more than 11k HP anyways. All you have to do is pin bigfoot with Rush and keep smacking it. It doesn't really matter if you get hit by a wraith or elder wraith, since it will kick you towards bigfoot, if you just keep spamming your attacking skill you will eventually kill the (elder)wraith and you will get kicked back by bigfoot and you will be back on the spot you were attacking bigfoot from the start, so basically all you have to do is watch your HP (since pets are a bit buggy atm) and spam your attacking skill while bigfoot is in the corner. As for the exp. My hero has gotten this amount of exp in just 3days from just killing bigfoot, so i'd say its AMAZING exp when no1 is killing any of them.
Now I see who was killing all the bf .. I made a video guide for Drk on how to kill BF effectively just by timing things right, without even getting hit by BF (can apply to heroes too). Like Seb said, you can get rid of wraiths or elder wraiths (this one bit more tough) when they approach you and just pin the BF back to corner again. These mobs will delay you down but won't really prevent you from killing the bf. https://royals.ms/forum/threads/video-guide-soloing-bf-as-dark-knight.88359/
So in conclusion, it really is unfair towards some other classes, particularly on Shadowers and Corsairs, because they can't kill as efficiently as other classes who have their core skills.