I mean, I find the toughest workouts I do to be those 3x3's. I'm always over ambitious also on them. It's just long enough past 2 min and just short enough of the "big dip" in power from this range to threshold that man........it freaking hurts.
I didn't post it in the workout section, cause run..........but I bought the Zwift run sensor. Worked flawless. I just hit the slope on the treadmill to match the Zwift % grade. Did a 10k and it was alright. Play some music, get some scenery. Perhaps come across somebody cool in there, never know.