I beat the wampa one today for the last 10 shards I needed. From my name it's clear though that BH are my favourite and mine are all G12 except bossk is G11 3* so doubt I can give much advice.
Other than that the wampa one is real tough in the last encounter with wampa he one shots pretty much anyone so you have to juggle ability block, stun and TMR between your BH's. If he gets AOE off it's pretty much game over.
The IPD mission is a bit easier but instead of just one mega hard boss at the end (I.e. wampa) it's 4 fairly difficult encounters. In that one getting around the stormtrooper and shoretrooper taunts is the main part so Greedo and boba dispell is handy