What temperature is the beer? If you carbed at room temperature, 25 psi would actually be on the low side of average.
Take a look at our friendly
carbonation chart, find your beer temperature, look for the level of carbonation you'd like (eg: many serve pales at 2.5 volumes of CO2) and that will tell you what CO2 pressure you want to end up using.
So, if that pressure is somewhere below that 25 psi, the SOP is to disconnect the gas from the keg and pop the PRV every time you think about it, for a good day or two.
Then connect the gas, set the pressure per the chart, draw a sample and see where you are. If you're still over carbed, repeat the process for another day.
Eventually you will tame that beer...
Cheers!