@moorebrother1 I still suggest testing some number of Snapcasters/Ninja's. I understand Snappy might be counter intuitive to the massive Delve plan, so maybe it isn't great here, but Ninja of Deep Hours can turn an unflipped Delver into 2 dmg and draw a card, and will do so more often than you think.
As far as other options to test off the top of my head:
Guilded Drake/Waterfront bouncer
Magus of the Unseen
Cloud of Fairies
I believe all these are mostly meta dependant tho, so will depend on that and testing to see what works. Best of luck! I have enjoyed BBS in all it's forms from Ophidian/Superman to Delver, and hope you do also.