My round with no warm up was terrible!
I like a bit of a warm up, but I think Joe's method is probably the most like what you'd get in a competition. If I recall correctly, according to Kick, sometimes he'd wait ~30 minutes or after warming up before it would be his turn to sling.
So, whatever you want to do should be fine. Honestly, it's not like there is much on the line, so even if someone does warm up a lot and does really well, the rest of us are just going to be happy that they did well! I know I'm pumped whenever anyone gets a diana!