My #1 favorite. Padron's are made to be smoked not aged that's why they are so expensive, ie. aged tobacco. They will likely loss some of they're strength and flavor if you plan on keeping them for years.
Cello on or off is personal preference. If it was a cigar worth aging I'd take the cello off and close the box to keep the goodness in. If you plan on touching, moving or storing them with other milder cigars leave them in cello for protection.
I used to be a cello off guy, but then I noticed AF Opus and Anejo would mellow out naked. The sticks that had their cello would not only keep their flavor but
actually get "richer". I don't know if they have a little "fermentation" going on. Now I keep cello on.