At PPL I was told a Rate 1 turn is 30 degree AoB at 90-100 kts
Scoobster, you were told wrong!
The basic rule of thumb for angle of bank for a Rate 1 turn is to take the airspeed, knock of the last digit, and add 7.
Eg IAS 100 kts, delete the right hand zero and add seven equal 17 degrees of bank.