Sounds a little below average to me. What kind of grind are you using?
Could be you simply need to slow down your inhalation rate slightly after the first few hits. And maybe a little longer warm-up, unless you're talking about all these hits being back-to-back, in which case you probably wouldn't need more warm-up, but it it would be worth a try.
Can also try holding the button in a bit longer, and continue breathing in longer and more slowly after you've let go of the button. When my FF is warmed-up and I ride that button a bit, I can keep inhaling for quite a while after releasing the button and continue to get vapor production.
But be careful to avoid combustion!
Chances are if you just keep at it, you'll find the right procedure for your needs.