Adore, first of all, isn't a bad brand at all. I think if you could stick with that... Doesn't it cover the grays?
The last thing I would do is go between chemical & cassia indefinitely. I would stick to one thing (Adore maybe?) until it has all grown out. And you can do that just fine. I didn't have good experiences (to say the least) switching between henna and chemical dye, but YMMV.
I never experienced shedding with henna but nonetheless it wasn't the right thing for me (dry, brittle hair just as it felt when it was bleached to death). My hair just can't take it.
I'm glad I'm rid of all dyes now, couldn't be happier with that decision. And there is no upkeep whatsoever, the freedom of that is amazing!
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