I work this bit of airspace.
Due to the interaction of LL traffic on WOB SID's I nearly always give a heading after 4A and an altitude/FL to climb to.
Within the LTMA, I would think that aircraft rarely fly to the end of the SID.
I have to rely on the fact that aircraft will fly the stepped climb's.
As a matter of interest, what level did you put in your FMS for this SID, 4A, 5A, or 6A ?
We have mode 'S', so we can see your selected level