You are right that low alk can make ph bounce around, but I don't think the high ph caused your cloudy water. Also the statement about the cya not protecting the chlorine isn't right. I think probably, your cl just dropped too low and that is why you are feeling the beginnings of some algae. I was out of town last week and although my husband added bleach for me while I was gone, I think he let mine drop too low. Because, although I couldn't see any algae, I could feel that my walls and floor felt sort of slippery like I had something starting. My cya is currently between 40-45 and I think he let the cl get down to 1. Combine that with hot sunny days in the 90s and water temps in the mid 80s and it doesn't take long for algae to try and start.

At any rate, get the cl up and keep it there for a bit and run that pump and you should clear it right up.