Basically I pack the vape with very fine grind to about 80% full. I don't necessarily tamp, I just sorta move the herb around so it's nice and uniform. I assemble the unit and make sure all the silicone pieces are as in place as possible to avoid any airflow leaks or seal breaks.
I power on the device and hold the trigger until green. Then I let go and do not draw. (only on the first heatup after turning it on). Then I do it again, heat until green and draw for the full 15 or so seconds until it stop heating with the vibrate. I do this for 1-2 hits on medium temp as I feel the herb dry out and the terpenes get released (overwhelmingly mouthwatering). The entire time I keep button side down like
@stickstones. I go to my temp 4 or 5 setting which is around 415-450 and I'll wait for the heatup (normally a long heatup with the big jump in temp, I tend to get better results when these long heatups hit. I pull for 1-2 seconds then do a 'puff' to see if any vapor is being produced. Depending on the thickness of that little puff I'll change my draw. For example if that puff produces a solid puff of vapor, I know the vape is heated and already producing vapor fast and I'll speed up my draw. With this increase in draw, I can get a massive cloud before the auto shutoff, I'm often finding myself not running to the second vibrate with this technique. If I do a puff and the vapor is super super whispy and barely producing, I'll keep my draw slow until I feel it build in my mouth then speed it up. Or I'll just use that hit as another preheat and try again with the next hit to get that good puff to increase vapor. Sometimes the vapor comes in so thick I do not need to do that puff because it is blatantly obvious I'm getting a large hit, I normally do the puff right when I switch temps as the vape is still cool and it's difficult to tell right away if I'm getting vapor because it is so smooth.
This is one of the few convection vapes I've ever owned where the vapor is produced nearly instantly after drawing. Most require the air to sit in the herb for a while before it starts producing, I'll puff right when the light turns green and almost instantly have vapor producing, it's pretty great!
Considering how large the bowl is, I think you'd have to have massively strong lungs to pull off hits that big. If I wanted to though and had the ability to, 430-455 would be able to.