Griffin radiator and twin fans still running at 190-200?

I spoke with Griffin radiator today. Customer service told me that they recommend installing the 185 degree temperature sending unit into the drain **** post on the lower tank of the radiator. She said the install on top the intake manifold may be creating adverse higher temperatures which will play games with the signal being sent to the relays to turn the fans on at the right temp. Also my negative battery cable came lose from the terminal end and she said that may also cause the sending unit to be sending a delayed signal to the relays which will cause the fans to come on at a higher temp. She also told me that they work very closely with Spal when designing these exact fit combo units and it should cool my car very nicely. So I am going to fix the grounds first and take her out for a ride. If I still have temp creep, I will install the sending unit in the drain **** as they recommend. Sounds plausible to me, so I will give it a try and report back here as soon as I get her done.