Your touch should vary with the instrument being played. Every bass has it's own characteristics. Active vs. passive electronics definitely come into play. I do think some bass players will pick gear and EQ it in such a way so they are playing light and letting the hardware do the work by adding attack and presence. I realize this tone has become a "sound" that folks strive for, but it's not for me.
^^^^^
I filled in for a friend on with a Chicago Blues band last Saturday night on his (P-)bass (it was an emergency, no time to get my own).
Passive of course, and of course the band needed to rock balls. I could never put that kind of energy into my play letting the electronics do the job.
I agree with those who mentioned the huge difference between soloing and 'fundamental' bass playing.
Tickling is o.k. but not between the pups.