Best fading methods for Blue Velvet and Midnight Blue?

If it is the new batch of Blue Velvet, I don't find it lasts that well in my hair.
Last time I had dark blue (Midnight blue and old formula Plum) I bleached my roots and the run off and shampoo turned it all a mid teal. I kept the teal for a few weeks (did my roots to match) and continued fading, then got the rest out with a colour remover. It was yellowy/lime then which was truly hideous against my complexion. I bleach bathed at that point because my base wasn't as light or even as I wanted, and it must have taken the lime green out because I went purple after, and that faded to lilac
If I were doing it now I would probably use bleach powder/shampoo/oils first

The BV isn't from the new batch, The reason I switched to Adore RN a few months ago was because I was tired of SXF unreliable supplies. I'll give vit C a try this week and the colour remover in a couple. Seeing as the bleach/oil/shampoo is the method I never tried, I might try that after colour removers if I'm still not happy. I just need to read more about it. There's so many layers of BV/MB to fade, I've got my work cut out, lol!

I find the bleach powder/oils/shampoo method the most effective and least damaging method for fading vivid dyes. Colour removers work best on faded dyes, and vitamin C is too much damage for the amount of colour it removes, I avoid it totally now. Dandruff shampoo is a better option.
The best way to do the bleach powder/shampoo/oils fading method is as follows:

Start by soaking the hair in coconut oil for at least two hours
Mix 1oz bleach powder with 4oz shampoo (sulphate based and without any film-forming ingredients eg clarifying/deep cleansing shampoo) and a teaspoon each of coconut and olive oil.
Really work this mixture into the hair
Cover, and add heat  from a hair dryer
Rinse after 5-10 minutes (longer is not better) with hot water.
Finish with a vinegar rinse to help seal the cuticle

You can repeat as necessary, but I would space the treatments out to see the best results. Oil soaks in between can help to loosen the dye too

Hmm, that has me thinking that I might need to reassess my methods and order I do them in. My ends are already dry, might not be worth the trouble of vitamin c if it will dry out more than fade.

My plan was to do the colour remover before the bleach/oil/shampoo, am I going about this in the wrong order?

Also, which anti dandruff shampoos would you recommend? Does it have to be head and shoulders or cheaper generic brands are fine? They all seem to contain silicones. Which ingredient is it that makes the hair fade, is it the zinc? I ask because I'm not sure if all the brands even contain this, I wouldn't want to buy the wrong thing.