Advice for purple/green stripey hair needed please

Hi there!
As a colourblind person, redoing my roots and getting my stripes right is a bit of a lottery, as I mix each shade as I do each stripe, and I've never get the same balance twice in several years 😃
I've always used a mix from magenta, ultra blue and uv turquoise by stargazer, peacock blue and violette by crazy colour.
This time, my roots have stayed yellower than normal, my pink looks kinda grubby/muddy, and the blues have a definite root stripe and look patchy grey in places. On the plus side, I've used green for the first time and that looks great.
So my plan is to bleach everything again and change my colours to green and purple. From reading this forum, I'm thinking of cerise mixed with Capri blue to make a bright purple, tropical green (which I used this time) and spring green mixed with flo glow.
My question to those who know their colours, is if those shades will cover the pastel staining that's always left after I bleach, or if I need to do extra bleach or some kind of toner before I do the new colours? And also, would I need to have another colour in between the green and purple.
I hope you can help 🙂
Ps. Dye parcel just arrived. To me, the flo glo and spring green look identical in the tubs! So quick question, do I mix a little flo with all the green, or the other way around to get it super neony? Sorry for all the questions 🙂