I have never bothered with that.
If I weigh myself and go to possibly better settings how is my ride going to improve?
BA Busa is spot on in his response.
Also consider that the stock suspension factory "settings" are really specific to no one in particular.
More so, I have bought a few new bikes over the years, and my friends combined have bought many.
I've set the sag on a lot of them.
Of all these bikes, you be surprised to know that most forks aren't even set the same left to right.
You never know where the suspension is set until you check it.
Garbage settings vs. proper sag is night and day.
Yes, it can result in a stiffer ride for the street, but then again it all depends how much sag you want/need.
My understanding has been 35 to 40mm for street, and 30 to 35mm for track(as tracks are much smoother).
If it's too harsh, then you can always increase sag some, as your riding is not at the level to need such handling; as in you want smooth and comfortable as opposed to railing corners.
Regardless, set the sag and be amazed. The suspension will work under the bike as it should. As opposed to being a pogo stick bouncing you over every bump, as well as sloppy handling and hard diving under heavy braking.
You'de be surprised the looks on people's faces once their sag is set. Even, bouncing the bike parked and turning a few clicks to make the suspension compress and rebound quickly(and without a double bounce at the return)can make a Big difference...then fine tune it by properly setting the sag.
Try it, you'll be amazed at what you've been missing.
I've been setting sag for a long time now. But it wasn't til a couple years back that TufBusa(old bastid), took some time on the phone with me. He finally made it click in my head exactly what was going on, and what to do, what to look for, how to adjust accordingly, ect. Have I improved? Most definitely. Am I an expert? Not even close.
If you get stuck, give Tuf a shout. He gets a bad rap for being brutally honest, but the man knows his stuff.