So... after hours and hours of trying to figure out why i was losing so much DPS on my parses after a period of time... I have discovered that Deadly 5 piece bonus is bugging out on "Channeled" abilities. (In this case biting jabs)
I discovered this by looking at my logs and seeing that every attack was dealing the damage as intended... but when i dropped 10k DPS on parse i was notiving that ONLY jabs was losing about 5k DPS. (Jabs is also the only channeled ability i have)
When deadly was working as intended, Jabs would crit from 15-16k while when deadly was bugged, it was critting for 13.6k
To test my theory... i removed deadly set and did a parse with Briarheart and saw my DPS go back up.... but not quiet to 85k. After doing a full parse, i swapped Deadly back on and BOOM. Deadly started working as intended and my Jabs went back to critting at 15-16k and my combat metrics was putting me back up to the 85k ball park.
First image is Deadly working as intended...
Second image is showing deadly not working on channeled abilities aka Jabs...
This bug seems to happen after having deadly equipped for a period of time. im not sure whats causing it. I am running the new Kilt mythic item, and im not sure if that is causing it to bug out or not.