I can't afford a BIS rare armour atm.

I was looking at ways to generate Frenzy charges while on boss fights. I loose a lot of damage by not being able to do that. What do people think about this?

I was playing in POB and by swapping out Belly with Farrul:
- I loose about 500hp, bringing life pool at 4535
+I gain about 600K dps vs bosses ( like Sirus) considering Frenzy and Power charges up all the time to a total of 2.3 mil ( without considering impale which POB doesn't calculate)
+ extra defence from cat's stealth.

Would the extra damage and the defence make it up for the life lost? I'd test it if I had the currency to spare but I don't. Thanks.