BH2: Preferred controller layout?

Hey guys, I’d like some feedback on the controller layout in Bullet Heaven 2. (especially from those of you who actually got controllers working)

I’d rather not program button rebinding because that’s a lot of extra work, and most shmups have the exact same controls anyway.

Using the XAB buttons for attacking and triggers for changing movement speed is pretty standard, but some shooters (particularly twinstick types) also let you use triggers for bombs.

So the question is, which trigger button would you guys like for bombs, if any? Cause right now they’re both used for slow movement. Would shoulder buttons for bombs be okay? Should I add an option to switch the left and right shoulder/trigger buttons?

Let me know how you play shmups.