Pete, your bass and mine AC 76-405 are very close.they were made within mere months of each other. The only difference being your top is Koa and mine is Zebra. Not that different in wood density. Yours being closer to walnut and mine to maple.It's interesting Will and I both found the flat's to be the right string for that bass. Thanks by the way, Will, for ordering such an awesome bass for me 35+ yrs ago. Every day I am excited to play your first Alembic.
Anyway, Pete, I am sure you will figure it out cause you got the disease. Alembimania. Snap! That should be a wiki definition.
Nick