IM subbed man this is an awesome strain. Unfortunetly My first DWC grow did not go so well and my bluebery seeds died but I recently bought some G13 haze and Confidential cheese for now. good luck ill be watching. Say what is your nute lineup? and feeding schedule?
you could try buying a little cheap de-humidifier from wal mart. That would be easiest. But if you do not have the money for it you could try just putting towels around your garden...Dry towels, or rice, something like that.
I have a 600 watt HPS in a 4x4x6.5' tent and it works fine. I would think a 8'x4'x6.5' tent should be good. and tents are perfect for storing heat. It actually is so good at it, it becomes a problem. And many growers are faced with how they will flush out the heat.
I would give it a few more days or a week, and let it grow to a bigger size. Once it is larger you will be able to tell 100%. Bc from that picture I cannot really tell.
In your situation 2-4 hours should really harm it but it would be better to have them constantly air-ated.
If your problem is not having enough air for transporting them you could try, plugging your airstone into your car outlet temporarly, or get a battery chargable pump for temporary uses.
I try to feed as my plant shows it. I usually start after the first week with minute amounts of nutes. I have a 1 1/2 week old seedling that looks like a little N deficiency. So I bumped up the nutes by 100ppm. I will continue to increase by 100 ppm every week....not that hard.