(Sorry for the wall of text just trying to be thorough)
I don't think this is viable for group content as mobs die so fast. I only mentioned group because that's how I was trying to get the spell to cast before being edumucated on why it wasn't casting.
All I had time for before raids tonight was two 15min parses on Combat Dummy. That did show a 14.92% increase to my bard's offhand blunt total dmg.
During raids I didn't see Feralisata get cast at all under the same conditions as previously stated even after it was added to the spellgroup for byos / byos custom.
Not sure what was going on there.
When I manually cast it, I got it to land.
However, it would only stay on for a short time before being overridden.
Unfortunately, my Shamans log was turned off so I couldn't check to see what exactly was overriding it during the raid.
After raids I spent some time trying to figure it out and the only thing that knocked Feralisata off of the target during that testing was Gut punch.
Which leads me to believe the stacking issue doesn't come from the % dmg increase but instead comes from the shared decrease chance to hit portion of the two debuffs.
The only time the feralize line would be viable is to either not have any warriors use gut punch (Not possible if they're actively running the plugin to my knowledge)
OR a check would need to happen for gut punch.
A check every 6 seconds though seems super excessive, problematic and not very likely.
Another option might be to introduce the option for warriors to choose to not use Gut Punch.
For this to even be considered, I would think a more solid parse would be needed. An actual raid parse with/without the debuff not a combat dummy parse.
Unfortunately, as long as we have warriors using Gut Punch, I at least won't be able to get said parse because our warriors use the plugin.
Feralisata = +15% 1hb/2hb
Pinpoint Fault = +12% Backstab dmg & +3% 1h piercing dmg
Ascendant's Intimidation = +60% Tiger Claw, Eagle Strike, Dragon Punch dmg
All three of those "stack"
Meaning each skill used gains the benefit of the appropriate debuff depending on what is being used.
1hb/2hb, 1h Pierce, Backstab etc.
Considering how important the +10% base dmg from Slayer Achievement is I'd think
the 15% from Feralisata would be near as important unless there's too few characters using 1hb/2hb in the raid.
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