Last quick thought on the Roto 77s. Roto says there is a risk of breaking with these strings if the strings are wound past the silks on the post: IE: if you have to wind so far that you have bare metal on the post rather than silk. There is also a chance of breakage and dampening of tone if the silks on the ball end rest on the bridge saddles.
This may be a cause of some of the challenges some posters have experienced with string breakage and a deadening of tone.
On my 34" scale basses the silks end up where they're supposed to. So, if you're playing Ps or Js or Rays or anything evqivalent in design with 34" scale or longer, the silks should be no problem.
I have a 33" and a 32" scale. These are now my most heavily used show and studio basses. I modified both of these basses to string through the body to create more length from post to string ball. The silks when strung on these basses now end up where they're supposed to.
I modified the shorter scale basses to specifically accommodate the Roto 77s. That's how much I think of these strings. They have delivered for me in every way for a long time and I had no wish to play anything else, so I found a way to make them work for me on the shorter scaled basses.
As I said, Roto discloses the circumstance about the silks, so it is a matter of "reading and following label directions".
Hope this helps.
Koog