Flash Lightning 40 Volume Complete Maximum Hair Lightening Kit : Long time user and lover but HATE the new smaller container

I have been using MP 40V for decades and I love it. I also have too-healthy hair - the kind that refused to take perms when those were cool, and often when professionals bleach my hair they go through at least 3 sessions of a weaker volume with less time than I do and my hair never gets as light as it would need to for the color it should. Or color applications fade extremely quickly even with color depositing shampoo and conditioners because the strands aren't porous enough to accept the initial dye in the first place. I use MP 40V on my virgin hair, which is about a level 2 or 3 (somewhere between a super dark brown and black) and add a bunch of blue tinted protein filler while I'm mixing it. I leave it on for somewhere between 60-90 minutes before washing it out for round 1, which takes me down to about a 7, though a bit patchy sometimes with bits nearer to a level 6 at my scalp and a level 8 at my roots. After rinsing it out and then applying an Ion Pre-Color Treatment Packet mixed with bottled water for 2 minutes and rinsing that out, I then shampoo with color-safe shampoo with my blue protein filler added to it along with a couple drops of green Punky Color Depositing Shampoo and a packet of "Unred Hair Color Additive" mixed in, which tones and heals my hair during the shampoo process, and follow with a purple conditioner. I then do a second round the next day if I am in a rush (if not I do an oil mask for a few days) to even it out starting at the darker bits (as opposed to being rigid about sections if I am doing my whole head) and doing the lightest bits last. I leave it on for up to an hour depending on how long it took to apply the bleach. When I am light enough, usually aiming for a 9 but it can be hard to tell with how orange it gets when I bleach prior to toning, I repeat the process from the first bleach and follow the steps to color.