Well a few things.

1. Relocate your ballast outside of the grow area. This contributes to heat.

2. The fan you chose looks really small. I'm guessing that ducting is 6" in diameter. You should look to get a fan that is the same size in diameter as your ducting. Also take out the bends. You want as little restriction as possible. I believe they make some duct boosters that flow like 300-400cfm. I would get the highest flowing 6" duct booster you can find.

3. In your 9th picture on the "updated room" album there is a white fan facing away from the water heater. Is this fan running? If so you are simply wicking away heat from the water heater and into your grow area.

4. Your humidity is way too low. I see it go as low as 16 and up to 25%. You want your humidity levels to be between 30-60% during veg if possible. I try to stay between 40-50% throughout all stages of growth.

Really you need to find a better location for your grow. This area is really going to be difficult to grow in.