I'm a bit confused on the lowercase J, because of it being so different from the lowercase i. But I mean, I think your lowercase works better than the upper. If you added a bit more width variance like you have in the X and the K, it would send the uppercases to a whole new level.

agreed the 'j' should have a longer hang.

i agree. breaking your own rules is cool , but theres no reason for makin the "j" shorter than the "g" :)