I have no experience in a PA28, but I don't look at the cockpit instruments all the time. I visually checkthe horizon in reference to the airplane cowling.occasionaly I do check the bank angle and variometer. But using the visual method I always find it to be at zero. Don't know if this is the correct technique, it is the technique I've learned and works for me. In the Cub I did give 50 RPM more power, not in the C152 unless passing 60° of bank. The c152 seems to hold speed fairly up to 60°