thanks. I'm using a round-bottom banger (+ carb cap + pearl). I got it because I read about the good flavor of cold starts. I'm putting in the (.04g) load, then heating ~ 5-6 sec. with a triple torch. the youtube 'tutorial' I saw used a creme brulee torch for more like 10 sec, but it said to stop heating when you see vapor. sounds like you're saying I need to heat it longer, yes?
If it's a 25mm banger I would highly recommend a larger torch, as it will pump more heat energy into the quartz during the same amount of heatup time.
Since quartz has a low conductivity it doesn't heat evenly. A larger, more expansive flame really helps a lot there. For cold starts I like to heat the sides of the banger first before moving to the bottom, this will help minimize oil climbing up the walls.
You don't have to finish the dab in one inhalation, but the closer you can finish it in one heatup the better, that gives you a reasonable "thermal window" - finishing in one inhalation generally requires higher temps, or smaller dabs. It sounds like you're vaping all of the flavor and then left with the rest of the cannabinoids to be vaped, which will make up the majority of the actual vapor. Cutting the dab size in half is a good suggestion (pinhead) just have to be careful when dabbing small amounts on a cold start as its easy to go too far at first and chazz it on to the quartz.
I think what you need is a bigger torch to put more energy into the nail, that way it's not cooling down so fast on you. This is somewhat a reality to cold starts off quartz though, cold starts intrinsically dont allow the nail to store as much heat as a traditionally heated dab. That's why I love the sapphire insert now for cold starts, as its basically a battery that stores a ton of heat, enough to get 4 or 5 solid pulls off a dab. The cream of the crop for vapor quality, IMHO!
edit: also, if youre using a spinner cap, some of the cheap import ones are seriously awful/unusable, not saying this is your problem but it could easily cause issues if its wonky.