To be honest I haven’t played in a very long time and I have no idea if all your threats are countered but I’m sure my prior knowledge is good enough to be at least a little helpful.
Crobat: Stick with BB and consider changing Black Sludge to Leftovers. The reason being BS can be tricked on someone else on your team and will always be having a negative affect while Leftovers is always positive.
Swellow: Burn Orb set with Protect is silly when not leading with it. If you’re switching her in on an EQ or whatever, she’ll instantly be getting the burn effect making your reasoning for Protect void. One could say however that you want to send out her in after losing one of your poke’s but why would you want to waste the chance of letting Typhlosion get a free switch? It’s still good for scouting, I guess, but you can scout yourself with U-Turn and have Steel Wing. Oh and another thing, consider Toxic Orb later on. Toxic Orb will do less damage to Swellow for the first 3 turns IIRC. If you find that Swellow is consistently staying in and sweeping stick with BO but if she’s only coming and going TO will keep her alive longer.
Typhlosion: I have no idea why you’re considering FP. As far as I know Blissey doesn’t exist in UU and you can’t can sweep with it (you could but really now). And you’ve even stated that you’re using it as a late-game sweeper.
Other: Swellow and Typhlosion especially are both at a disadvantage considering you don’t have rapid spiner. Typhlosion for the obvious reason of weakening Eruption which is probably the only reason people use him to begin with and Swellow for the fact that you’re already slashing off 1/8 every turn. Also, and this is just me again, I feel you might have trouble switching. Something like this scenario Steelix vs Nidoking, predict EQ switch to Swellow, opponent switches to Rotom. Gastrodon is now your safest switch but not a very good one at that. Actually now that I think of it, you’re just plain lacking any kind of special wall.