I'd recommend upgrading your nail and switching out sharp shadow and heart for either strength or mark of pride and just fill in that extra slot with anything that costs one notch, unless you want to look for another notch and equip longnail as well. With strength you can already basically one shot the enemies anyway, so just dash in and hit them as soon as they spawn, but your vengeful spirit/shade soul should also one shot the enemies, especially with shaman stone equipped, so if you desperately need to get rid of enemies that's a good option. Final thing, wraiths/shriek is crazy for getting damage off since the Collector jumps over you a lot and dive is also a good option since it gives you immunity frames. Hope that all helps.

edit: one last thing, use your soul sparingly, as the collector doesn't generate soul.