Shads,
From this end: Depending on BF% and thickness/maturity of muscle is how i help them pick a show or series of shows in terms of how far out they should start contest specific work.
I like to look from the following perspectives:
20 weeks out to 12 weeks out at maintainence cals with some calorie cycling to keep a slow and low fat burn and bring up any lagging body parts by slamming them after high cal days.
Diet truly starts at 12 weeks out (unless a LOT of fat needs to go) and the first four weeks are at 300-400 cals below maintainence, decreasing by near a 100 cals per week from week 8 to contest prep week.
Last week looks mostly like monday, tuesday and wednesday at low carb, heavy water. Carb up starts thursday morning after a deplete workout wednesday pm.
Friday is same cals, but meals every 2 hours, water basicly stops at lunch. Very low water, sips and ice cubes saturday morning with carb up for real and serious glucose partitioning. About three AM friday morning a cocktail of a little water and glycerine with a dash of red wine... two hours before stage in the morning, rALA followed by a cocktail of glycerine, red wine and caffeine, another half portion of same 30 minutes before stage. Same cocktail program for evening show, with just a little more volume...