Congrats on the new Blacktail. We're too much different in draw length and weight for me to recommend an arrow to you. I can say that my Blacktail likes a stiff arrow. I draw about 29", the bow is 54#@28", and I'm shooting 30" ACC 3-60s with 175 grain points. The shafts are a 340 spine. I have three recurves, all around 55#, and the BT needs the stiffest spine of the three.
My nock height, shooting three under, is right at 5/8" above level. Post some pics of the new bow if you get a chance.