Clearly not as you used ash and violet for lifting from a 6 to an 8.
The lightening curve tells us that as we lift from a 6 to an 8 we see orange, orange yellow, and yellow. We need to counteract all of these tones.
/8 to counteract the orange.
/6 to counteract the yellow (which there won't be much of because pheomelanin is more resistant to oxidation so it'll be an orangish 8 rather than a yellow 8 unless using bleach or highlift.
So your perfect formula would be 8/86 which we can make by used 8/81 and 0/65 for the violet (only a small amount) and i'd also add extra 0/81 to cut out any warmth.
P.s ash doesn't neutralise anything it only softens/subdues.