Blood Music

Definitely Ashurs could be added to that deck, whether the extra masters though would clutter the deck or not, I don't know. Currently, the deck flows reasonably well.

For the OP, concerned about blood management for his deck, also consider:

Concert Tour
Entrenching
Blood Tears of Kephram (not bad considering it doubles as prevent for you and you've got a weak combat package - and have mentioned that your local meta includes a bit of combat).
Giant's Blood
Archtypes - specifically Perfectionist
Underworld Hunting Ground
Rave
Gird Minions

Some thoughts based on the deck list and what I saw last week:

• Weak defense put you in a situation where you had to go backwards all game. I love Grail's suggestion of Concert Tour - you could use Minion Tap instead of Blood Doll!
• 6 more Shattering Crescendo would be much better than the Quietus actions.
• Sudden Reversal stops all the blood gain master cards you don't want to see.
• Selective Silence instead of Fake Out.
• Strained Vitae Supply?

Dorrinal wrote:

I love Grail's suggestion of Concert Tour - you could use Minion Tap instead of Blood Doll!

Vessels works better with Concert Tour .
1) Start of turn, have X blood.
2) Untap phase, remove as much of X as you have Vessels.
3) Still in untap phase, fill up with Concert Tour.
4) Profit!