What hand in your agreements would bid a forcing NT but would not be a semiforcing 1N in a standard system? What hand would bid a semiforcing 1N in a standard system but would not bid a forcing NT in your system? If the answer is none, then your forcing 1N is identical to my semiforcing 1N. Add to that that sometimes you pass 1N when you think it's right, then guess what, you are playing a semiforcing NT!