I’m not experienced in metal - it’s an age thing. Led Zeppelin and Black SabbathIt is! However... in metal bands it’s often helpful (or even essential) to be able to hit the same open low string as the guitarists. IMO of course
think we’ve covered most options already, but just to say that low F# is achievable with the right strings and setup. Your main issue is pushing enough speaker area to be heard!
Dropping to C# is also a great idea though.
We’re the heavy bands when I was practicing in the garage.
Now, the musicians I play with are happy to hear correct notes regardless of how I play them.