Does everyone's daily reward graph go up and down with peaks and valleys based on the Luck factor? I'm surprised it's not a smoother curve!

This is a noob question, but it has had me stumped lately because it seems to be happening all the time now. Can anyone comment on long delays for new blocks showing up on the statistics page after the last one is confirmed? The miners show they are working on a block number that is higher than the last bock listed. Is it that blocks aren't listed until found and we only see found blocks being confirmed, not the ones we are searching for?  Thank you! MCTV

I have three block erupters and five ant miners.  The ant miners together show 9.9Gh/s the block erupters together show 1.01 Gh/s.  No problem there. But the 3 much slower block erupters are only 1000 blocks away from keeping up with the ant miners, when both started at the same time.  Showing 6026 blocks for the ant miners and 5100 blocks for the block erupters. 

Can anyone explain what I'm seeing? Are the block erupters more efficient at mining? Here are the bgfminer windows:



Thanks!
MCTV