just keep the pcs my gosh lol
they are good pipes, you likely wont feel much power difference going from the pcs to the slps and slps will have less rev to them and you WILL feel it in wide open stuff. Good pipes for the right type of riding. Not that pcs are a high reving pipe either but they get a few more turns than the slps. you over thinking this
also how much are you riding around idling who cares what it sounds like before the powerband, if you are riding it right youill be in the power band, not farting it around in 2nd gear