About the 30psi thing....
When I got back into riding, after not touching a bike for 12 years, I really could not remember what pressure I needed to run in my tires. So I ended up deciding to run the same pressure that I used in my car tires (wouldn't want to ask anybody and loose my street cred!).
Well the ice skating act I put on during my first ride in a group was nothing short of breath taking, literally I ended up high siding and knocking the wind out of myself.
Years later the folks that were on that group ride commented on how squirrely I was. Luckily I was pretty dialed in by the time we got together again.