I find shorty or LP shorty packs expand and puff very easily than standard packs. All my shorty packs and 1cell packs have all puffed up. My standard packs from the same brand have not puffed up the slightest when treated the same.

Also, what are your charging habits? If you are the few that likes to charge and discharge at 30-40amps then you are very likely to puff and shorten the life of your battery very fast.

Lastly I think you are killing your cells by putting them in the fridge. They do not need to be kept in the fridge u less you intend not to use them for an extended period.