There are a lot of bloods already capped(they usually sacrifice a lot more then they gain, but still.)
And from my own experiences, aoe raid damage that gets you below 75% is way too spikey. You dip down and up, losing a lot of damage. Shouldn't ever sacrifice heart strikes to get a death strike out just to get you over the limit, and it doesnt help that your only supposed to DS twice every 20 seconds.
Blood arp capped works. I did 12k on fester 2 weeks ago (5% buff) with Arp cap and 2 trix.
I just went unholy this week because i was having some amazing bad luck last week with pest resists and when your pest doesnt hit it trashes your dps(i was getting like 3-4 resists an encounter last week with 8.2% hit)