I think if we are mining LTC then the profitability should just say 100%, never below. If you are mining LTC you are getting 100% of what you should be getting with it, just sometimes that's less then you want. It's still 100%.
No, you are not, and you are bad at maths.
100% LTC = Estimated found blocks in the period with the current pool hashrate. That will never be the case, it will be more or less. If we get less, like 89%, we can't just say it was 100%, since Terk would have to pay the missing 11% from his own pocket.
If we get more, say 138% and we say it was 100%, Terk would be pocketing 38% of the earnings for himself.
Your maths and common sense is terrible.