Raid Arlong is the best bet here, he removes block orbs, gives all matching AND boosts orbs. You can then use the free log-in Shanks after for an easy clear
On stage 6 use Burgess to get a 5 turn buff and clear,
Stage 7 use Oven special, dps if needed, and use the second Oven on revive. Works for now, might have to do some change at higher level.
Cav+Zoro should be enough for a long time, sabo and mihawk can be used later on for more dmg.
Vs Nami – alt
Basically tank your way through stage 6,
use all buff raid doffy, clear stage 6,
poison stage 7, clear stage 7.