Best to just have a play with it.
B1 is stock boost and also 'stock like boost control', so won't kick in as aggressively as the performance settings, which might help with traction/torque steer.
B2 - B9 are just tiny increments in boost pressure (and onset aggression) up to stage 1's maximum, which is 1.35 bar iirc.
Or you could just stick the SPS in 'Stock Mode'.
Yeah T&F are fine as they are.