Thanks for all the details!
Did not hear about Fulcrum before, but it seems to be a bcash-first product supporting the ?ElectrumCash v1.4.5 protocol.
Curious did you test native SegWit and Taproot address support?
Both native Segwit and Taproot working well. The developer appears relatively chain agnostic.
It would be interesting to see if ZRAM can improve indexing time with the Fulcrum fast sync parameter!