The actual bass can make a major difference too.
My old Strunal was a total nightmare for feeding back,a total nightmare,I had everything damped & an extra sound post but still had problems.
My Duke however is nothing like as prone to feedback,I do still cover the f-holes on a loud stage though as it is a major help when cranking the volume.
BTW if you tape the f-holes you need at least 5 layers of gaffa tape for it to work.
As for magnetic pickups - for me yuck,I hated both the sound & feel of the steel strings.
I run through a GK MB800 Fusion,everything set flat apart from the bass control which is set around the 9 o'clock position (bass cut) & can play stood in front of the amp at pretty high volume with no feedback.