[hopfenundmalz]

There are some Bock water profiles at braukaiser.com under the misc. Section.

[malzig]

Hypothetically, if for some reason I could not get a good ratio AND keep the Cl below 100 ppm, it would be more important to keep the Cl levels below the threshold than to have a good ratio. Am I thinking about this correctly now?

I've used 120 ppm Cl- in my Dunkel and it has come out quite well (I only have about 10 ppm SO4--).  I wouldn't worry about 100 ppm being a hard upper limit for Cl- and I can imagine that a higher level could work for a Bock.