Well, now you know what it feels like at times to be a plumber 😛 We get a lot of the same mushy answers and wiggly science. However, there may be a way out of the mumbo jumbo. Hobo is a brand of inexpensive datalogger that can show you how your system is performing over time. For troubleshooting, it really beats individual measurements for seeing cause and effect. http://www.onsetcomp.com/ is a good site to look at.
I suppose, like computers, if we don’t have good info going in, we don’t have good decisions coming out 😉