I think you have all the info in front of you, you're just not seeing it.
The only way that your water would drop 7 degrees, is if your rad suddenly started running better, and that means that the fan is pushing more air through it, since you took the cover off.
Sounds to me like you have an airflow problem.
If you have 3 fans in your PSU (which one is it, btw), where one fan blows in (from the bottom) and the others blow out to the front and back, then I'd give some thought into reversing the front fan.
For the lovers of the negative case pressure, you have negative air pressure in your PSU, but you have positive pressure in your case, and it's preventing your rad fan from being efficient. Reverse than fan and you have the exact reverse situation (may not be good for the PSU though).
Alternatively, you could remove (or disable) the front PSU fan.
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