Problems with dark ash blonde dye

I’m having problems getting medium/dark ash blonde without it going brown. Long story short, i used Wella 7a medium smokey ash blonde on my hair which was a blorangey colour on top with blonde lengths. I did a bleach bath before to get as much as my previous blonde dye out as I could. I knew the top of my hair still had orangey tones so I chose the smokey ask over the normal medium ash because it was blue based. I really like the colour my lengths have gone, it was exactly what I expected, but the top is more of a golden brown now. It looks a bit weird going from a golden brown to an ash blonde, it doesn’t blend very well. I really don’t want to put any more bleach on my hair, but how can I make the top the same as the rest of my hair, or at least more ash? Would using some more of the same dye help? Or do I need to use some purple tones now? I have some Wella cooling violet left over from when I used to have silvery hair. I would consider bleach bathing again as a last resort but I really expected this blue based dye to work on my hair as it was, I definitely didn’t expect it to go so dark and brassy!
If I put cooling violet in wella 7a, would it give it a blue/purple base, therefore targeting orange AND yellow tones?