So the setup I used for this is a program called Joytokey to get my xbox 360 controller to have turbo on. I have menu and cancel set to repeat 30 times a second and I timed pressing them to have them alternate to buffer perfectly. Thinking about it setting them to 15 times a second each might make it more consistent.

Some more testing, with a 60hz turbo these skips become free to do. Can get perfect menu buffering every time, so I did a run of Memoria and skipped all the bosses first try(except Deathguise because I forgot)