Well Lavis Cannon can be written off straight away, because Redria Slime is the best way to hunt it and nobody would bother hunting it on Yellowboze/Whitill in Episode 2.
Psycho Wand is somewhat similar, though it has merits from Bluefull Delbiter and Oran Gibbles, although with the advent of MA4 in BB, it's hard to argue that it's better to hunt in Episode 2, especially since both of those enemies already have 80% base DAR.
Zanba is not that popular because of Yunchang in BB, and only males can equip it, so HUnewearl and HUcaseal have other items to use. DoB is very good from PW2 though, but since people play Redria Episode 1 a lot, there are plenty hit DoBs floating around from people just playing that.
I'd personally list the following as worthwhile hunts from CCA-Seabed-Tower (so, this HBR):
- Diska of Braveman
- Monkey King Bar
- Zanba
- Sealed J-Sword (Skyly)
- Psycho Wand (Bluefull/Oran)
- Heaven Punisher (Purplenum/Skyly)
Maybe a couple of other tidbits, but they're not popular enough that I remember them.
Compared to Episode 1 and 2, that's hardly anything, and many of those aren't very coveted or particularly wanted.
It's pretty much fact that hardly anyone plays Episode 2 in general, and it's because of the drop table rather than the difficulty.