If the weather is good, why not just cross DMYHL at 1200' for 13L and 800' for 13R and start your approximately 800 fpm descent from there. Then pick up the VASI's(actually, I heard PAPI's are being installed) and make your slight adjustments. By doing that, you know exactly what point to start your descent.
Can be a bit more difficult in the early morning sunrise though.
Last edited by JammedStab; 11th Dec 2017 at 21:42.