I can't tell from your pictures but how do you have the vent fan setup? I would assume the top vent is the out and the lower vent is the inlet with the tubing ran to the furthest side. I would try running the outlet vent tube to the upper most opposite corner from the inlet, that way it should be pulling the warmest air out.
Also you could try getting some smaller stones 4-5" and place them by the inlet that way they can retain the cold and help regulate the temp. The down side to that is since they will take time to heat and cool if they are warmer than the incoming air they will slightly heat it.
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