This is a fundamental misunderstanding of what a simulcast site (aka simulcast cell) is. A simulcast cell consists of two or more physically distant tower sites that transmit on the same frequency at (essentially) the same time and identify by a single RFSS and Site number combination. You cannot "use one site at a time" within a simulcast cell - the prime site and the subsites of a simulcast cell all transmit on the same frequency which can cause reception issues with radios not specifically designed to receive simulcast signaling. Bottom line is you cannot avoid simulcast issues by using "one site at a time" if your selected site happens to be a simulcast cell. Looking over the FCC data, there appears to be several simulcast cells in the PSERN system.
You are absolutely correct!
My point is, by using the closest site, ie the strongest signal, should keep the scanner (in this case) from locking into a more distant signal (site) source.
My Unicaton G5 will sometimes "lock on" to one of four different sites (so far), with various degrees of decoding success. By limiting its reception to one site, it receives/decodes flawlessly.
My Uniden 325p2 won't lock onto any site consistently, if I give it a choice of sites.
By limiting it to one site, it keeps up with the G5 in decoding TGID/voice transmissions , although the voice can sometimes be a bit garbled from multi-path distortion.
I'm sure everyone's mileage may vary. Just sharing what's working for me...