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Usually the problem is dirt in the fill valve and not an adjustment problem...
depending on which valve you have it can be taken apart and cleaned out... just remember to turn off the water supply before taking the fill valve apart...
for the upstairs if the valve is fully on there is not much you can do other than replace water service to the house or heaven forbid repipe.Valves usually don't restrict fill volume.But you can take the supply loose from the tank and stick it in a bucket turn the valve on and check the flow.this should narrow it down.Down stairs repair or replace flush valve