If you aren't getting clouds from concentrates either your device is broken or it's user error.
I can tell you that I can get a nice cloud on my very first draw using concentrates so long as the draw is long enough and you hit the sweet spot.
For me I can literally pack the FF2 then begin taking draws at the same consistent speed and I'll get clouds all the way through very easily.
Like someone else said above If your device is in proper working order and you're having issues with wispy vapor and you've done everything that's been mentioned then I'd be willing to be you're drawing too hard or not long enough.
@BRAND1SH I notice in your video that your draw length is actually very short and that was your first draw on the pack. You heated the FF2 up for awhile before drawing which is good but then your actual draw was only ~10-15 seconds. Remember that the load is only heated while you are actually taking a draw. I can't tell how hard you were drawing but the whistle was loud and clear which means you might be drawing too hard.
If you took a 10 second draw while drawing too hard on the first draw of the load I am not surprised at all that you got the lack of vapor production that was in that video.
Try the same thing but take longer draws, slower draws, and more draws. I'd say the first draw or 2 draws are warmup draws, after that vapor production ramps up as the load is heated. Good luck!