[Help] Some Trouble In Right-Hand Picking

[anotherbbs]

When I did some alternative picking : 3 notes on 4th string ,another 3 on 3rd string then back to 4th one . As u know , I should use downstroke when I pick back to the 4th string ,but on the way my hand move back down , my pick sometimes lightly hit the 4th string with a slight upstroke . Maybe I didn't move my right hand enough to skip the 4th string ...

Has anybody some experience on how to solve this ?

Thanks

(The left bar is the right exercise , when I play ,sometimes I give the right result)
http://www.atticmf.com/bbs/attachment.php?s=&postid=125892