Seemingly high coolant temps and manual switch for fan relays

It has been warming up outside recently and I have noticed that my coolant temps seemed higher than they have been. So I researched and installed the "fan relay switch" in the diy forum except I simply just grounded the wire. This seems to help unless I turn my A/C on or I'm idling for a while. I wanted to know if I could put a switch on the other relay to turn the higher speed on for better cooling. Is this possible? Or is it a good solution? What are my options? My temps get into the 200s often with the A/C on. Is this even a big thing to worry about? I know in the new and potential owners thread says that 220 is bad for the coolant seals and 240 is extremely bad. But I'm sure to never let my temps get that high, I either turn my A/C off or get up to speed and coast to cool it down. I have never pushed it to see if my temps will get that high or not. But seeing people say they hardly ever see temps in the 200s made me nervous to try test it.