It sounds like you are using and enjoying the pax plus the same way that I use and enjoy my pax 2! Half bowl lid is the way to go to get the best performance, I feel.
I think the pax gets a bad rap for being "wasteful" of herb, because of sticker shock loading so much into it, as well as people using it incorrectly. Sounds like you are using it correctly, though!
You left out a very important bit of information; what temps are you hitting and what does your abv look like at the end. The chemicals don't have anywhere to go but in the herb, in your body, or wasted puffing into the air.
I think that devices like the dynavap and vapman promote microdosing, and deliver high temp full spectrum by default. Microdosing as method can deliver surprisingly good effects off of less. Pax is not a microdoser, for sure.
Personally, I use my pax 2 on two petal setting, and let it build heat over a whole session. Abv comes out evenly dark brown. I'm usually vaping the entire .25g load in a single, long, lazy session. I'm also blowing vapor clouds for fun, puffing on it like a joint, and just generally purposely being wasteful of the CBD. That said, I feel like it gets me about as high as that same amount of CBD does in my other vapes, and extracts far more than other electronic conduction vapes I've tried.
In short, idk?