I've started shaving my head with a str8 (thx 4 the video, BTW) and I'm not nicking myself anymore, but I have two problems.

(1) Results are not uniform. It looks OK, but I can feel stubbly patches where the shave is less close than in other places.

(2) Head shaving seems to wreak havoc on the edge, so I put a very coarse edge on my very thick Allen razor & reserve that for head shaving.

Do these issues straighten themselves out with practice? I don't have either problem when shaving my face.

Do you use the same razor on your head & your face, or do you have a dedicated head razor?