Tried the wet towel trick for the first time today with a chocolate cake,
just like my buttercream woes this failed big time, lol.
I think I got a bigger hump than without the wet towel trick.
No biggy though those humps taste good.
sometimes to avoid a hump, i cool cakes upside down. on a parchment
Try one layer with, and one without the towel for a true controlled experiment! Have you made the same recipe previously without the towels? This may be less domed than it would be have been with no towels. Those look like pretty deep pans, so it may also help to lower the oven temp and use heat core nails. Some recipes rise a lot and need to be leveled no matter what you do.