If henna gets to be a lot to upkeep and to maintain, I recommend just trying to balance it out. Perhaps do a henna gloss in between and just root touch up s as needed. Don't over burden yourself with full head applications. It will make you feel better. One of us here also does henna along with yoghurt. They were very happy with it.
As for the sift of the henna powders Jamila and Rajasthani henna they both have the SAME sift. They are superb !! Fine as baby powder. Rajasthani indian henna just has a faster dye release then jamila. A client used the rajasthani henna on their palms and this was the color result (so dark). See here:
Moroccan henna has a less fine sift and you will find some sticks/fibers in it, but NEVER dirty. What we usually do in body art to elminate the fibers in the henna powder is put the henna through a stocking (that has no support toes, forget what its called) but just a cheap one (and like a knee high really).
You put your paste right into it and then put that into a plastic bag (like a carrot bag or ziplock) and start squeezing all the way down towards the bottom until all the henna passses through. There will you get a fine henna paste. I always do this with moroccan henna, but not usually for a hair treatment. Ours still washes out well as there are not too many fibers as some can have. It doesn't bother me personally.
