There has only been a few cases where I've actually willingly ate a soul crush, and they're normally when I'm up 2-0 and don't want to have to deal with trying to conserve the bar against people like the sisters, who have surprising breaking power.
Alot of whats been said in here is spot on. Though be weary of poking strings. As far as my experience goes, a Perfect GI breaks a flashing bar instantly. Even with online delay, if they see your berserk B's coming, you may very well cut your own throat.
With the lesser amount of GI's online, I find I'm fighting the foe's soul gauge more then them. I'll give up the 28bg air throw and instead go for a AG airgrab to set up a 1(A)A or 1 (A)B just to keep them gauge trouble. No one likes being flashing against Astaroth, and once they are unless you seriously lose your cool and give them openings, you're going to force them to eat alot of things. 66AB in particular.
Online, I'd wager about 1 in 3 of my matches ends with a 3rd win CF. Offline, I'd need more practice to see, since its much easier to intercept and GI alot of Astaroths big meatie Soul Gauge eating swings.