I think you also asked this in the PRS forum :)
"Bright" and "thin" are not the same, even though they may be an appropriate description on one and the same guitar. "Bright" in my terms means that the guitar has a lot of highs and high mids but still a healthy bottom. If that is your guitar, the Crawler will work well.
"Thin" in my terms means that the guitar is lean in the bass and low mid department. It does not necessarily have to be bright to be thin. If that is your guitar, the Crawler will not really add bottom to that, and the Alnico Warpig may be the better option, even though I never played one. I never played a Silo either.
Cheers Stephan