Have you thought of adding Falkenrath Noble? He has basically the same ability as Blood Artist but is a 2/2 flyer in addition. Yes a 3B casting cost is high, but it might help speed things up. Also, Diregraf Captain's ability only triggers if another zombie you control dies. I don't see any other zombies for it to trigger. Swap Falkenrath Noble for the Captain maybe?
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I haven't been able to find a single Ajani anywhere besides online for a price that's just too high for me. I like your ideas on lingering souls and will probably switch out the Gaurdians of Akrasa for them. As for the Knights I was seriously debating between glory and infamy but I tend to see more white at my local shop, (U/W Delver) so that's why I sideboarded the glory and mainboarded Infamy.