You'll have to pardon my lack of reliance on current stats. I use historical information being that history is a better indicator of the future than the present.
Perez is having a good season, but you could very well be evaluating him at a hot spot. Perez has never been a bad pitcher, but his best K season was still just a .69 K/I year, and he's right on that for this year. He actually had a higher K/I in his lesser seasons. His H/I is a little below his career average, but he is making up for that with more BB/I, which means his W"HIP is still higher than his best season (albeit lower than his historical averages). Even if he's hot right now, there is nothing to indicate that he will do anything different than he has done in the past, which is be average. Like I said, he's not a bad pitcher, he's just nothing to write home about.
Benitez has his very well-known history. You can choose to ignore it if you want. That is your choice, and that's the fun part of fantasy baseball.
As for Peavy, his HR/I rate is so far below his historical average that you know it is going to come up at some point. Again, if it doesn't, great for you! I am just pointing out what history tells us about this young man in San Diego. Of course, he's got the new Litter Box to keep his long fly balls company, so I wouldn't be surprised if his HR/I drops this year. The fact is, though, all of his key indicators are so far over career numbers that you have to expect a slow down.
You stated that you thought your team was "very good." I didn't think you should see this team as that, so I was simply offering info from the other side of the coin. Please don't throw around comments like "You don't know what you're talking about" unless you have very good reason. I could very well have opened my review of your staff with the same comment.
I hope this staff does work out well for you, and I hope that Perez and Peavy break the bonds of history and have unbelievable seasons.