BiblePay is CPU only for both PoBH (Proof of Bible Hash) and PoDC (Proof of Distributed Computing). PoBH is proof of work with some tweaks.
On vultr, they will reset your VPS if you run at 100% cpu. So, at most you could probably use 50% safely. On the biblepay.conf, you would need to add a line called minersleep=500 which means biblepay miner sleeps 500ms per 1000ms.
another idea is to go the "unbanked" route and do PoDC. where you don't need to stake anything to mine and must use ARM processors only (e.g. Android phones or ARM based CPU). You can look at running BOINC and earning BBP using PoDC. I saw this place where you can rent bare metal C1 ARM server.
I let MIP on Discord know. I think he got it to compile on macOS. I have 10.12.6, so I can't test it unfortunately. Let me see if I can find someone with 10.13.6
You said 1.1.4.4 works okay but not 1.1.4.6f?
As a last resort, you could have your backup for Time Machine and try 1.1.4.6f again. Except for wallet.dat, you can try erasing everything else in ~/Library/Application Support/BiblePay/wallet.dat It could be Biblepay or BiblepayCore
How to show Library folder in Finder: http://osxdaily.com/2016/12/12/show-user-library-folder-macos-sierra/
After you delete everything except wallet.dat you can start 1.1.4.4f again and see if you get different results.
These are all recent changes, but like you, I'm not a programmer... https://github.com/biblepay/biblepay/commits/master
Let me know how you get along even if it crashes...