How much more restricted would you say the FF2 is in comparison? Twice?
Definitely quite a bit, but not bad at all. I can rip on it pretty good. When I got mine used, I took it apart, including taking the oven screen out, and gave it a thorough cleaning including cleaning every single hole with a pin from both sides
Since then, I haven't found the restriction bad at all (the first couple times I tried it before doing this thorough cleaning I thought the restriction was a little much).
I use
@herbivore21's technique, which is basically, 5 sec or so draw to heat things up and melt the concentrate, followed by a draw until it shuts off (20 sec?) that is as firm as one can where it is still comfortable ... I actually find this can be a quite firm draw without much issue. (I've got some solid lungs though and not much really bothers them ... but too much restriction does ... like if I overpack my Supreme that bothers me ...) Hard to overpack the FF2 with concentrates! (at least in a way that would affect draw)
The first hit is awesome, and the 2nd hit of the same is likely only maybe a half hit I would say so the taste isn't as good. Awesome clouds, by far the best flavor for concentrates of any portable I have (ie. really awesome), and literally zero waste.
To clean concentrate pads ... throw in a zip-lock with 99% ISO and heat in boiling water ... not sealed ... you don't want it to blow! ... as soon as the ISO is bubbling a little, shake vigorously, put back in water, repeat. Then do a rinse, get fresh ISO and repeat. After that, the ISO usually comes almost clear as I get most of it on first pass and the 2nd pass is just diluting the resin soaked ISO down to get it out of the screens better. Before last step is to throw all the screens in the boiling water for 10 minutes or so. Finally, I place them in the oven on a little foil "tray" @ 275F for maybe 30 min and then they are ready to use! Clean as new!
Edit: My good battery gets 5 sessions (I have 2, and one I don't think is good though as the one time I used it I only got 2 sessions as it died at the end of the 2nd session). My good battery I have used frequently though, and I've never had it die on me (I've never used it for more than 5 sessions though as based on the level at that point it's not likely to make another)