Forgive for my newb question

Why would my average pay outs for 24 hours consistently be less then what I should be getting If I were just mining LTC?

I thought multi-pools were slightly more profitable...

FYI I am running 10 L3+ miners and getting about 2 LTC a day on average yet LTC difficulty has been down and has been sitting between 2.4 and 3 a day for pay out (mostly). if you were to just mine LTC. I would think that the multi-port pool would switch to LTC if it is more profitable. That being said, my payouts with 10 miners should be over 2 LTC.

What gives?