I practice slappin’ and singing along with metronome or drum machine.
For me singing while you play help to understand space, not overplaying, stay in tune and learning lirics is always useful.
I tried FMI weed pro, not happy at all.
They are expensives and E and A are completely dead.
Now I’m usin Eurosonics light, they sounds good, and better every day, slappable and ok for fingerstyle, I love them.
My jazz upright doesn’t part from spirocores.