Best timing for Sum of All Thrills?

SoaT is one of my favourite attraction at WDW, because I’m such a geek.
TP has the line length perpetually at about 21 minutes, regardless of time of day (and including times when Innoventions is closed).
We were there once in the early am and it was basically walk-on, but for our May trip on a 3 day looks like we’ll be doing Epcot in the afternoon… any idea what kind of waits we might face? Hoping to do 3 or 4 rides.

In the afternoon we usually have to wait between 20 and 30 minutes (crowd level 6/7). I once saw it at 40 minutes, but we came back a couple of hours later and it was back to 20 minutes. Think it benefits from being less well known than other rides in Epcot (this is our favourite ride Epcot)

last week I found the time to be over estimated, and generally around 15 -20 minutes, when it was a lot longer… give an hour and walk by and it was back to 15-20 minutes. I think the longer times coincide with a show/event ending.