Ditto to the above poster.
Anyways, if you wire it up to run with the ignition, you're going to be putting a lot of unnecessary stress on the charging system. As said above, I would think perhaps the fan isn't covering enough of the rad to properly cool it, however if you were having these cooling problems prior to doing the electric fan swap, chances are you have something else going on. Honestly, a cooling system in proper operating condition should stay somewhat (within 15 deg or so) close to the t-stat temp even with that Proform fan.
Secondly, are you judging your temp by the stock gauge? If so, don't bother, it's pretty inaccurate.
How is your temperature when you're at speed or on the highway? If it goes back down, I would definately suspect lack of airflow across the radiator as a possibility. If it stays the same, I would think perhaps you've got a circulation problem, are in need of a flush, improper coolant mixture, etc.
