Of course we mine LTC when it's the most profitable. You just can't find the same number of blocks every day/hour/minute/second.
If you throw a dice with 1-6 numbers on it, you will get 3.50 result on average. But you will never actually throw 3.50 in one throw. Sometimes you throw 5 or 6, sometimes you throw 1 or 2. You understand that, don't you? In long-term average you will get 3.50, but average of three throws can be anywhere between 1.00 and 6.00.
Mining coins is no different. The shorter the timespan the more variance there will be. Guess what. If you check minute-by-minute stats you will find a lot of 0% minutes and some 3000% minutes. If you check second-by-second stats you will find mostly 0% seconds and the second when we find a LTC block will have 180,000%. You don't find a block every second. You don't find a block every minute. You don't find the same number of blocks every hour.
Never saw it hit 0% (probably would indicate you messed up), and I have definitely not seen it breach 3000%, or hell, 180,000%!! LMAO! Either you have a better insight on stats, and should provide similar data for miners on your pool, or you are a hell of an exaggerator.