Soft crab that have already peeled are more watery than peelers,this is why they loose their scent quicker. When the crabs peels ,they do so to enable their inards to have a new bigger exoskeleton to grow in.An average crab can peel upto 3 times a year. When the crab feels its ready to peel(in the late stages of being a peeler when the crack appears in its shells sides)it takes on lots of water to pop out of the old shell and then its almost double the size it was before it decided it needed to peel....so this taking on of the water to increase its size is the reason why soft crabs have less smell than peelers in the earlier stages of peeling. (The peelers have more consentrated juices and smells.Plus all the pungent orange "gunge" that fish find irresistable and easy to home in on)
A soft crab can still be a good bait though,especially for Wrasse,Bass,Smoothounds etc. Not so much scent as a peeler in a peelers ideal state of peel for bait,plus a softee doesnt stay on the hook intact as well as a peeler for powerfull long distance casting,or withstand attacks from Wrasse without being ripped off the hook as well as a peeler.But i know anglers who target wrasse alot who swear that softees are best for Wrasse.
But for close in work for bass a softee is a brilliant bait!!Plus if boat fishing for Smoothound a softee is Brilliant!!
Soft crab dont freeze as well as peelers due to their high water contend and are best used fresh really. But using your method of clingfilm to wrap and freeze softees is fine,they will when defrosted catch fish,best on a boat for smoothound etc....on the boat ive had Smoothound,Bass Wrasse,Dogfish,Bull Huss and Conger on frozen softees. Ive not tried frozen softees as much for shore fishing,but ive caught a fair few smoothounds on them,when i have tried,plus a few Wrasse....but down here the Bass seem to prefer fresh crab more.
If i go crabbing i usually keep the softees to use alive....but if im not fishing soon, i will freeze them as they can be a usefull bait to have.