Yes, and thanks again for jumping in. I am considering grabbing a larger torpedo keg in the future, but for now I can only work with my 2 corny kegs, one of which is getting 5 gallons of stout this weekend.
Thinking through the dry hopping, I am considering cutting a muslin bag to eliminate the excess material, making it only large enough for the hops, a metal object, and to seal it up; I am thinking this will eliminate a lot of dead weight after being dipped in sanitizer, making it easier for the magnet to hold.
I will be pressure fermenting and got some anti-foam that I plan to use, hopefully that, paired with 10 -12 PSI, will keep my krausen at bay. I want to fill the keg up to the welds (4.75 gallons?), so I will have only a few inches of space, and if I can get the hops attached closely to the underside of the lid, I think I'll be in good shape.