House built in 1999, all copper pipe.

My wifes shower has been to hot ever since I increased the water pressure in the house.  ( I use the mud room shower, and never noticed any difference in my temp.) 

We did drain the hot water heater and installed a water filter for the incoming well water. (We have our own well)

Could we have dislodged some particales that are now blocking an orifice in the single handle shower controller ?

The water is not to hot at the sink.  Meaning it meters the water the same now as before increasing the pressure.  Single handle units on the sink.  

Can I turn off the water and take the shower controller apart ?  Turn on the water for 5 seconds in the basement and try and flush the controller ?  

Should I just call the plumber ?  Hate to if it is a simple fix, but hate to screw up the shower controller.  You would have to open the dry wall in back of the shower to put in a new

shower conroller.  Nope, don't want to go down that path if possible.  

Suggestions please.