any reason you don't have the cooling fan at 100% ?
I set mine for 0% for first 2 layers and then 100% for the rest.
There's really no point in anything but 0 or 100.

so speed is 60mm/s ?

220 seems very hot for 60mm/s
210 probably a better bet.
Far as benchy's go - just never seen the point.
Print something small you actually want. Then if it works it's a gain and if it doesn't you haven't wasted much plastic.
makerbolts are a great test piece: https://www.thingiverse.com/thing:9095/#files
make the bolt 1% smaller and the nut 1% larger for a really smooth fit.
Great for fiddling with or giving away as they demonstrate a lot of practical applications of 3d printing.

The peg thing would sounds like more a design issue than slicer issue.
check wall thickness. If you set up s3d right it will use single walls - but unless you tell it to, it only uses double walls and won't actually render parts that only use single wall.

I think you're maybe just printing too hot and with not enough cooling.
didn't know they'd release 4.01 :-)