Heavy Blows is the culprit here (theory)
After watching Zonflux's U19.3 video (https://www.youtube.com/watch?v=DP3LmqAocWs), I've come up with a theory as to why Prey on the Weak heals are procing so rarely. When Zon was fighting in Helegrod Spider Wing (towards the end of the video), he was only getting PotW heals when he used Sweeping Cut and not from Vexing Blow, Whirling Retaliation, War-chant, or Guardian's Ward. The difference is that SC tiers up bleeds automatically, but VB/WR/WC/GW only tier up bleeds when they crit (Keen Blade base trait + Heavy Blows set bonus). This makes perfect sense that Heavy Blows would be causing problems, since that was specifically one of the changes they listed in the U19.3 notes. In other words, they were fiddling with Heavy Blows to fix the "bleed falling off on resist" bug, but ended up introducing this bug. It's possible something else is also up (Zon mentioned Insult to Injury and Radiate), but at present I don't see as much evidence for other causes.
Hopefully a SSG dev reads this thread and is able to fix the bugs plaguing the Guardian...and then yes, please give us a preview on BR so we can test things before they go live! Without this critical testing, more players will be driven away from the class and potentially the game itself.
“Merely having an open mind is nothing. The object of opening the mind, as of opening the mouth, is to shut it again on something solid.” - G.K. Chesterton
On Landroval (Redemption): 111 GRD Lifthil, R6 | 86 WDN Liftward | 64 HNT Beinhareth | 53 CPT Liftspirit | 49 BUR Julo | 32 RNK Liftstoner | 17 CHN Liftbro | 15 BRN Liftbeorn