I use the "normal" dome out, pointed at the camera method for most shots. I duplex, dome in, when back lit. You'll see what that means when you get Dunn & Wakefield's book.
I developed 8 rolls Saturday from my RB and metered that way; every frame was exposed "just fine thank you", not a single screwy exposure in the lot.
Verify the right ISO/EI is dialed into the meter then trust what it tells you.