Did you do many cycles of mixing and letting stand before each pull? If not, next time you do pulls, mix better. Shaking is not necessary but you can mix thoroughly many times over and over with stiring. (From your description this might be your problem)
Was the whole mimosa mix properly black? If not, add more lye.
How long did you wait for it to crystallize before trying to retrieve the DMT? If a week or less, leave it for at least another week more, sometimes it takes long to fully crystallize. Add more FASA after retrieving the DMT and let it stand for another week and see if more crystallizes.
By the way I hope all this DMT is not gonna get sold or given away indiscriminately, its a lot of spice there, but im sure you already know that and will take good care, right?
