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.
Following investigations regarding the accuracy and integrity of FCEUX, the SMB1/2J moderation team has decided that FCEUX will not be permitted for future submissions, effective September 17th, 2023. The accuracy of FCEUX has come into question following 108Pi's discovery that the current SMB1 Warp