@Francois Blais . . . Francois Blais to the Strings Desk please . . .So a question for the intelligencia
IME the biggest factor in 'half-position' tension is a properly-cut nut. How's yours?... after changing over to my older set of Weichs, the G string still feels like it’s got a tremendous amount of tension. Very uncomfortable to play in half position. The D string is half as bad. The A & E are ok.
FWIW, here is The Big String Tension Chart. It's going to be helpful for comparing brands and gauges but it does not show data for solo-tuned-down. As you see, Spiro Weich G pulls 60.6 lbs, Spiro Mittel G pulls 67.2 lbs and Spiro Solo A tuned to A pulls 70.5 lbs.I guess I could try a lighter gauge Spiro on the G, but what’s left ... a Solo? I could try swapping out the G & D with some Obligatos I still have, but last time I tried them, they felt like they were rollin’....
I have purposely avoided the string rabbit-hole. They all play out of tune on my bass.