Are higher dye content hennas worth it?

I'm not happy with how henna covers my grays (or NOT covers them I should say) or henna and indigo. But since I've used indigo in my hair, I'm afraid to go back to boxed dyes or salon color.
I've bought a couple mehandi.com samples but I didn't get a chance to try them on gray hair so I don't know how it will do. I don't have many grays but the ones I do are stubborn and in noticeable locations. Is mehandi a lot better than Jamila? My Jamila is BAQ. Also, is it possible to cover grays with henna glosses? I prefer that method to straight-on henna. I read that it can add just as much color as plain henna and water (and a dab of lemon). Is this true?
I specifically am interested in the Rajastani Twilight henna. That is the highest dye content. I've used some of their lower content like Jamila. Thank you.
I've bought a couple mehandi.com samples but I didn't get a chance to try them on gray hair so I don't know how it will do. I don't have many grays but the ones I do are stubborn and in noticeable locations. Is mehandi a lot better than Jamila? My Jamila is BAQ. Also, is it possible to cover grays with henna glosses? I prefer that method to straight-on henna. I read that it can add just as much color as plain henna and water (and a dab of lemon). Is this true?
I specifically am interested in the Rajastani Twilight henna. That is the highest dye content. I've used some of their lower content like Jamila. Thank you.
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Comments
I remember seeing it in the henna for hair book:
Henna for Hair
Maybe you have extremely resistant gray though, and nothing will work easily without extreme damage.