C2L27L,
watch the next few go-arounds at your place and I'm sure you will see at least half of them either level bust (especially off 27L)or miss the turn any way. Be even more careful in CAT 3!!
There could be a case that if you change any part of a clearance you nullify the rest of it (don't agree with that personally) so be wary. So if you ever decide to take anyone off a SID or a published Missaed Approach procedure give a heading/track and level. In fact I think that is now standard on your CPT off 09R? Don't you now add 'maintain 6A' after the heading instruction?