That’s what concerns me. The sound post is waaay out in center field. It thinks there’s a righty batter trying to push a hit.If your bass speaks better under tension, then S42 Mittel are the easy choice. Arco issues with Spirocores are generally thought to be overstated for non-section players. I would GUESS that the right set for your bass would probably be the right set for your bass, whether arco or pizz, but it's a guess.
The s42 Mittel G-String is GLORIOUS on my bass, arco and pizz. But the full set stresses my bass out in ways that make me uncomfortable.