How

consistent*

at the start of wall jump room walk off the pipe not holding B. when in the air after walking off the pipe start holding B. do a forwards walljump. that setup gives you 2 frames to do the walljump instead of 1.

I'm new but what has worked for me is, Jumping off the pipe to WJ pixel. I was unable to ever hit it the normal way.

Something else I just started fooling around with is, Not holding R when I jump, Then resuming holding R during the jump.

Don't know if it's just me but it seems to hit the pixel more often.