It sounds like youre confusing pressure in the keg with carbonation. Because I rack my beer 'bright' to the keg I have to force carbonate my beer which involves increasing the pressure and chilling it so the co2 is absorbed. (some people rock their kegs or something similar to force carbonate, that seems like alot of effort to me). This may have to be done more than once if the keg isnt consumed within a few weeks.
Once the beer is carbonated it will stay that way all the time there is pressure in the keg, much like a bottle of soda, the drink is fizzy but there is only a small amount of pressure (the co2 has been absorbed in the soda). The 3-5 psi set on the regulator purely to deliver the beer out of the tap.
If you notice I dont talk about excess carbonation but excess co2, I could have described this as excess pressure but of course its only excess to the void it occupies, once it is absorbed into the beer its no longer in excess but serving a useful purpose carbonating the liquid (again try not to confuse carbonation with pressure, dont forget you can have a carbonated beverage under very little pressure, remember the soda bottle)
Now if you'll excuse me I will draw off some carbonated beer from my chilled keg with my regulator set somewhere close to 3-5 psi just to confirm I am correct.
BTW, if 'balancing' your kegs keeps you happy dont let me stop you, i'm sure it serves some purpose, how many can you balance at once, can you tap dance too