I took the 10 extra skill points into Blood Magic and picked up Vampiric Rituals but I was curious about it, the only Well I see myself using in this build would be Well of Suffering, so is Vampiric Rituals really that useful? Would Mark of Evasion be useful as an alternative to Vampiric Rituals? It leaves Mark of blood whenever I dodge.
I would drop the 10 points in Blood Magic back down to 20. Since you are only using 1 well, Vampiric Rituals isn't going to be a large benefit to you. Throw the 10 points in to Curses to pick up Barbed Precision and Weakening Shroud (adds some utility to DS). Since you're going to have a decent amount of crit, Barbed Precision gives you some more damage.
Also, while Quickening Thirst (T2 Blood Magic major trait) is nice with the passive 15% speed boost, you get better utility out of Vampiric Precision, Dagger Mastery (you're using two daggers so this benefits both), or Mark of Evasion.