Is there a pool that is doing better? For example, I looked at the BitMinter's stats, https://bitminter.com/blocks , and they look like they've been having lots of long blocks also.

I have never used anything but Slush so I don't know what other pools are even worth considering if someone were to "jump ship". Am I correct in assuming that by joining one of the largest pools, that because of hashrate the larger pools get more rewards more often, but also that the rewards are also divided up into that many more pieces and so one's daily net would not really change except to vary with luck, the same as to just stay at Slush?