Who are your starters?
If you have guys like Ubaldo Jimenez, David Price, Phil Hughes, etc. then I say keep plugging away. If my make it to your start limit in August, that should be fine as long as they are all quality starts.
Also, with about 15 to 18 starts or so for most starters, perhaps some trends have developed? For instance: are your pitchers better at home or away? If you have a pitcher who has proven so far to only do well at home, sit him on the road every time.