Bulkmuscle, is your calculator correct? It seems to be a little off. I just plugged in the numbers to simulate a single administration of 600mg enanthate and got this:-
day 10 - 331mg, day 21 - 160mg, day 31 - 83mg, day 42 - 40mg
Shouldn't it be close to 300, 150, 75, 37mg?
Anyway, its an interesting topic you brought up. Not many calculate the compounded amounts of all the injections and their halflifes.