That said, some questions . . .
190c is my sweet spot. Maybe go up to 200-210c for the last hit or two, I also get about a half-dozen but I can't handle monster hits (some here can do an elbow in 1-2 hits). Like Stu I also puff prime the whip. Also given my more modest hits, I take the draws fairly quickly one after the other, and therefore I don't clear the whip with each hit; I pull the GonG end of the whip from my bubbler to clear it (i.e., the bubbler) and then reattach the whip - no need to prime the whip again as it is still filled with vapor.
Re breathing, a tip I picked up from Pappy - I take a big breath thru my mouth and then exhale it thru my nose; this leaves a little air in my lungs which seems to help avoid too deep a draw and is more comfortable. I also take a long slow pull; you'll get the most by filling from your diaphragm and up, but that can be too much (at least for me, too much vapor in my tummy upsets it); I concentrate on filling my entire upper lungs and bronchi and larynx. I hold ~10 seconds, then exhale first thru my nose and then mouth - moving the vapor back out thru the nasal passages adds absorption.
I hit until I see no more vapor in my exhale. That results in a solid brown ABV. It's possible to hit more until the ABV is nearly black, milking the herb for all its got, but that tastes like burnt popcorn. My brown ABV has sufficient CBD's left to make for a nice tincture which I use for making a late evening "sleeping pill" bowl.