I have been playing with soft Elk Masters & Brunswick Blue Diamonds for 46years. They were & I think still are some of the softest tips out there.
I just got an OB Classic with a Kamui super soft tip in June. At first it was virtually unplayable for me. Way too soft & required much more stroke to get any speed onto the cue ball. I was advised to take a few layers off as it, as it is very thick. I did & it plays better. I just played with it on a very fast Simonis 9 footer yesterday. It did not work well, for me. I changed shafts to my McD i2 with a less soft tip & it was like night & day. the speed control I simply could not get tuned in with the Kamui was right there. The reason is, I feel, that you can stroke softer & get enough on the cue ball without the larger stroke.
So...the bottom line is I have no real answer for you. It's simply what do you want?
Personally, I would suggest not going with a super soft. That's the best I can do.
Good Luck with whatever you decide.
Regards,