New Hydrangeas Drooping?

I have fallen in love with hydrangeas this spring. I live in Indiana, zone 5. I bought 2 bigleafs from a store around Mother's Day that were big and beautiful! I am having a hard time keeping them that way. I kept them in the pot because I was told to wait to transplant them until they go dormant in the fall to keep them from shock. They do not get direct sun. I have no room on the "morning sun" side of my house, so they are on my shaded porch. Sometimes I put them in the yard for afternoon sun. My pink bigleafs are doing well. My blue ones are drooping and I have tried putting them in direct sun for a while, watering them more, etc. It's just been a game, which is quite odd seeing as they are 2 feet away from my other one that's doing well. The blue one has some brown leaves, droopy leaves, soft leaves, and maybe one or two that are okay. One I pruned off completely because it had totally fallen over droopingly. I'm confused. The woman at the store told me to water them daily, but then I read that I shouldn't if the soil is moist 2" deep. So I haven't watered them much because they feel pretty moist. Our weather has been crazy! It's basically rained 2 weeks straight with little sun. Help!