Pretty sure i've never met a fat vegan. Though most vegans I've spent time with seem to know their stuff much more than I do.
Your ingredients are amazing! Rather than stop the smoothies all together why not decrease the amount of seeds? Sunflower seeds are known to help weight loss... assuming we don't eat too many of them.
I think they just had a lot of fat and calories, if I plant more kale next year I might spin a few up. I just drink powdered superfood drinks now. I have a brown "supergreens" drink that I really like and I mix a scoop of that with a scoop of my pre-workout "explosion" and then later I have a green "supergreens" and another scoop of "Explosion". The brown greens drink has a bunch of medicinal mushrooms in it.