ive never had too much trouble with wolf, i find hes recoveries are really unreliable u can often get a sneeky ledge hang or even spike him off the ledge with the dash attack (classic old school game and watch tactics!)
but yeah back air is always a good option but make sure u fast fall and dont leave it too vulnerable, alot of good players know how to punish it between the last air hit and the landing hit so make sure it lands early. also dont be afraid to distance yourself by using the up b if they get in too close. its really brilliant for combos on game and watch it gives you spacing and doesnt leave u helpless like most recovery moves it can also chain well into and out of moves like neutral air, up b, then foward air or whatever the situation calls for , game and watch is brilliant for keeping the pressure on with multi hits and making the opponent losing balance with the air from up b and up air.
with wolf i guess keep them afraid to use the lazer but dont be too trigger happy with the bucket unless your safe as it does have some lag on release. also although back air is good, you need to vary your approaches, keep them guessing, try instead of spacing up b to "just hit them" try doing it all the way over them and landing the other side, this makes it harder for them to throw u out of there shield. also try mixing up with some down air but dont be obvious with it, try spacing tactics with neutral air as it is great for juggling specially as a follow up from up tilts etc