How long have they been in their containers and how have you been fertilizing them? Also, your custom mix sounds very moisture-retentive. Blueberries like a well-drained medium.

I agree with fortyonenorth. Your mix sounds way too complicated and water retentive. Last year I bought a Bluecrop, and a Blueray from a nursery. I simply repotted them in double ground pine bark. The mix drains very well. I add 2 tablespoons of vinegar per gallon of water. So far they are growing very well. They don't need much fertilizer. Maybe you should repot them. If you can't get the double ground bark, you could just add a little peat to some sifted pine bark mulch.

Hi kushy,
What's the temperature been lately?The reddish leaves look very typical of cold soil and if so,warm weather should bring some green to them.
If they were mine,I'd get rid of the Cedar and use Pine bark mulch.It's better in the acidic category.
I'm not sure about the other things going on but if any answers are found,I'll post. Brady

What type of fertilizer are you using and also list your fertilizing schedule.

If you can recall, list each potting medium used in a quantity.

This will make it much easier guiding you in the right direction.

Ron