Gee I slipped this thread. I've used Dunlop SB SS for more than a year on my TRB6II. I also have a G&L M2500 strung with Foderas. The Foderas are much more polite, darker tone (edit : and a bit more piano-like). Not very crunchy. I changed pickups on the TRB6, as you know, and I think the nickel stings are better on these pickups/preamp combo. However the slinky strings I use tends to sound thin rather quickly even if a slight low end boost does the trick. So I'm back to SS on the TRB6 with the Foderas because I had too much problem with defective C strings with Dunlop (it's presumably corrected but too many defective sets on the shelves in Europe I believe).
My opinion is that some strings impose their character on the PU/preamp whatever you do it sounds the same just EQed. With the Foderas well you can EQ different tones out of it it doesn't get int the way. For example, removing highs when they're new does remove the brights (which are not plenty to begin with. polite strings as I said). With Dunlop SB, remove highs and you get the same sound, just muffled (it surely also depends on your preamp highs frequncy band, but you get the idea).
They're definitely a match on my G&L M2500, not sure on the TRB6II/Delano combination. They're not unpleasant, but they seem to lack a bit of character. I'm wainting for them to break in, though, and to be fair I have much to explore with my preamp and plucking hand position. But at first glance I'd say what I would really like is the nickel mellow sound with the satinless steel fatness. Maybe with the nickel dunlop SBs ?