Blueberry plant kickin my butt

Hi all. I need help with a Blueberry plant. I moved my garden to a new location so I am sure there are some variables to consider. The plant was orginally a mother for about a month. After the move I decided to flower it. It is about 2 feet tall now. It has taken 3 weeks to get the new location set up proper but I had to move the plants. Fresh air was very limited and this plant was root bound badly in a one gallon pot. I have since installed my co2 system and repotted into a five gallon bucket.

Specs:

Soiless Coco

Ferts Dutch Master A + B Flower Runoff @ 575 PPM

Temps Day 70-80 F Night 60-75 F

PH 6.3

Co2 1500 PPM

Base H20 70 PPM PH 8 adjusted to 6 + CalMag to 250 PPM

Lights 2000Ws HPS 18" from plants

3rd week of flower

R.H. 35%

It has only been 3 days since I repotted and added the CO2. It looks to me
like a classic mag defenciey but the numbers don't really say so. I don't want to make any wrong moves here and cause more problems. Anyone think from the photo that this can be caused from Lack of fresh air and to small of pot? Any recommendations? Thanks, T