Hi Bloggs,
Why would you delay the left turn from the SID turn point?
I don't know what the SID says (I don't have access to it), but notwithstanding, our Flight Operations Performance engineers supply the EOPS's along with performance data and calculations. I daresay they would not ever look at the Air Services SID charts. Besides the SIDs are not designed around Terrain avoidance necessarily.
Cheers