I’m running 2 purgatorys at the moment, great tyres IMO, not draggy, grips OK in mud (it’s not brilliant, but its a lot better than I expected) and was fine on general loose natural trail.
The Storms are good winter tyres too, not sure I’d want one on the back of a FS though with something big on the front, might encourage you to ride beyond the tyres limits. Saw a guy running them frotn and rear on a 5 last night and he seemed to be doing well.
If your spending time riding rocky lakes stuff and some muddy stuff then I’d go purgatory f+r. If it’s muddy stuff with occasionaly rocky rides I’d go for storms and learn to ride smootley or swap tyers for those rides.
Storms don’t work in the dry at all though I found.
As for 2 blis, mine went up fine with a track pump and 4 layers of electrical tape to seal the rim (DT X470), deflated and added sealent.