To answer your first question, you can get d70, d60, d50, and d40, with l,l,l,l+a pole inputs. l,l,l,l+a,,r is required for d30, and l,,r,l+a,_r is required for d20, d10, and d00.
The colors getting messed up might be caused by using pellsson rom save states.
If you want help with anything in the future, joining the Super Mario Speedrun discord would be a good idea.
Hitting 8-4 wall jump pixel depends on your “wiggle” (going from right to left to right) You will have to learn the muscle memory for the speed of the wiggle. (There are also setups to make hitting the pixel more consistent)
About falling fast accels, all I can really tell you is you need to do a perfect fast accel, then r,l,r (08 flashing) or r,_l,r (19 flashing) or r,l,_r (A2 flashing) off the pipe.
Regarding thr 8-4 walljump have you seen kosmic’s tutorial on youtube?() I’m not an expert but following that setup i managed to get it most of the times
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