My BPD is close by just slightly neglected at the moment. Its not going anywhere.Agreed.
I love the flexibility of the -1 is great, and as you said, "really balanced dirt sound and slight variation of the GOAT" is a solid description of the RBD.
It's become my favorite low-gainer.
The -1 is set for more of that "bi-amped clean low-distorted highs" type of sound.
The BPD is set for that "Tool-H" intro tone.