Striker bossing combo and question

Which one has better dps?

Barrage>tab CSB>drain/FF repeat
or
Pure drain

Also how would SE affect this? I have a feel that SE benefits barrage more o.o





And, how does a striker, or bucc outside of S.trans handle papu? Just tried it, it always stun me when it get out of shell shortly, and then it turtles again. Making it really slow and annoying, most of the time I'm being stunned =.=