Henna gloss query

When applying a henna gloss, say 2Tablespoons henna to 100 grams cassia, and achieving a positive result.... In the future, I would like to continue having henna in my mix as it is so friendly with my hair. And, i don't wanna go to the dark/purplish/ realm, as the color doesn't suit my complexion. So, how often can i gloss, and will it build up too? Love the condition/shine/red highlights.... my skin just doesn't handle the burgundy well... looks too harsh/dark for me. Thanks!