Should I be running 1 core solo mining for each BN?
For now yes, I am implementing proof of service for mining now (may take a while as i can't seem to keep my eyes open)
Full re-sync? Try to use the -connect switch and sync from a node that's fully synced , fro then on , your node will ignore bad nodes
use these :-
addnode=41.191.238.189
addnode=82.211.1.181:8877
addnode=91.230.123.101:8877
188.193.114.167
+
addnode=91.230.123.11:8877