I had shifting problems, including false neutrals, when I first got my bike new. After about 1000 miles things got much better. Don't back off the throttle too much, preload the shifter, and when upshifting, move it all the way up. If it doesn't want to move, don't force it. Blipping the throttle will usually help line things up. I was used to the snickity snick shifting of Japanese bikes, that really didn't care how you did it. The Enfield will get better as it breaks in and you get better at shifting it.