ok, first look at what is/are approved tires for SilverWing 600---bike has sticker, Bridgestone and IRC....these are tested within the standards of how Honda feels the bike should perform----tackle box techs can seldom out guess them.
Second, psi numbers printed on side of tire are the psi the tire has its max. carrying capacity----I use only what Honda recommends---at least gives decent ride and remember scooter is not super bike, it is putt putt, enjoyable to ride.
I had best luck/feel with IRC on Silverwing, horrible tiremileage with hoop rear, at to replace hoop front due to nail early.
Right now, not following makers recommendation have Hoop front on my 25,000 mile Burgman2011 ABS leftover (OEM) working well in combination with Michelin SC rear ----running at Suzuki recommended pressures(I know this is not recommend inthis combo....but works well on scooter that does not handle as well as SilverWing or TMAX)----I believe secret is using Ride On as balance medium, tire stays in balance for life....and doing own tire work.....that makes sure work is done right and carefully.