Hey there I just posted a review of my own for this carto! I totally agree these things just plain rock! One tip I've kinda figured out is that if you get to that point of almost-dry-hit, just suck in without... wow ok I started typing that before your video finished and then you said it yourself lol.
I gotta say if you haven't figured it out by now these things last forever. I'd be curious to know if you've ran one into the ground yet, because I haven't had to open a second one after about 2 weeks now.