Question for A-grade BDs

I'm in the process of getting a +4 Sam*Tsu for the focus SA, and I'm curious about A-grade.

With Death Whisper 3 and Dance of Fire, my crits are more than 4x my regular damage. Assuming I will never lose DW3, is it even worth upgrading to A-duals? If I can crit twice as often (each crit being 4x normal swing) is it really worth upgrading for 50 more p.atk?

I need to know from any BDs that have had the chance to test A-duals w/ DW3 compared to Sam*Tsu w/ DW3.

People generally continue using highly OEed TSU*SLSs at 61+ because there's no focus A-grade dual. Not to mention they're quite expensive. Not sure how long this'll remain effective though.

i prefer the patk speed over the "increased crital hits"...

if you've got extremely high dex and str already.... the extra patk on the weapons make a huge difference to your equiped patk..

going from +4 TSU/SLS to SLS/SLS +4 gives me roughly 50patk equiped.... going from +4 SLS/SLS to +4 KESH/KESH gives me roughly 300 patk equipeded.