Hi just got my Dynavap M late today so of course I had to try it out. Loaded it up twice & got a single jet dynavap torch to get it going. My first 2 hits in each case were very robust got a nice volume of vapor, I was drawing hard. Then my next 3 draws were nothing like the first 2 but good. After that it feels spent. AVB makes me think its got more to give its somewhat light color.
Should I repack and try again or just dump these crumbs to my AVB jar?
It doesn't hurt to give it another go until you know it's spent, a darker roast is likely with a conduction vape. When it's done you've usually roasted out the more sedative compounds--I think this is what accounts for the high feeling 'strong' for it's size and also what makes it great for winding down. On the other hand, there's no harm in stopping when the flavor is done, or if you want a more heady than body buzz. Save the lighter abv for cannabutter.
I usually finish an M7 bowl in two heatings, with a weak third for cleanup if I'm being anal. My AVB comes out fairly dark. I get several hits per heating. You sound like you're comfortable torching it already so it's just a bit of experimenting and refinement and you'll be taking it right to the hit size or doneness level you want.
I had heard i can draw as hard as i want w Dynavap or should i be doing long slow draws?
Try both. I usually rip it more or less. George recommends pulling hard with the air port unobstructed:
https://www.reddit.com/r/Dynavap/comments/gaiknq
That said you can also do mouth to lung pulls, not exactly ripping but using some pressure to achieve a similar thing.
Overall it is a winner as it was super easy to use, got instant results , the click is very audible & yes it does offer a "joint " type experience. Best of all the taste is impeccable.
Really glad you're enjoying it. I love using Dynavaps and I really think the M7 is one of the best.