@Rob: other similar coins' wallets have the handy "-resync" flag for this process; would it be possible to implement this into the BBP wallet?
What is resync? Do you mean -rescan or -reindex ? options are available as tools under wallet repair.
I'd try a reindex before you blow everything away except wallet.dat in your biblepaycore folder.
Nope, I mean "-resync". It's two levels "above" rescan (which only scans the blockchain without changing it) and one level above reindex (which uses already existing block files). It automatically deletes all blockchain-related files and re-downloads it completely.
Yes, addnodes are also a good idea. I usually don't have them in my configs but if necessary I add them manually to running ones (like today for the 1185b wallets).