I'm not sure of the Terrain about Mex,I know it's 7000 or so .AGL.Flaps 1+f are OK if the runway is long enough.As you know flaps3 will get you off sooner,but your 'hot'second segment might suffer.I Remember that 'Canadien'had to do the approach with flaps 3 to meet the goaround performance(3.05.35fcom)