I have been putting timing belts on Honda/Acura products for 15 years, and have never heard of the belt being on too tight. Now, if the timing belt was installed and a new tensioner was NOT installed, then the tensioner bearing may be at fault. More than not, though, the screaching sound comes from the other belt, i.e. the altenator belt. Slippage of this belt, especially when starting, will cause the screaching sound.