Thanks for the information. I started biking for 2 month after my college time, so I'm a beginner.
I'm about the same weight as OP and using 25/28 on my 2 bikes. When I bought my first bike with 28mm tires, I felt the ride were so harsh until I reduce it's tire pressure little by little to a point that the ride is comfortable to me. My 2nd bike with 25mm has much better ride comfort with higher pressure. Since both bike are used, I have no idea how old those tires were. Both have continental Gatorskin tires. I am wondering if the age of tire/tube also contribute to the ride comfort.
Ryan