Scotty,

Here's a couple of things that can affect roll rate and how to fix them.
1. If you are using a single, center mounted, aileron servo, it may not be strong enough and may be letting the asilerons flatten out due to the force of the air. Hold in full aileron and see how easy or hard it is to move an aileron with your hand. If it's pretty easy, you probably need a stronger servo.

2. Speed affects the rolling force, more speed, more force and a faster roll. If you are running an 11-6 or 10-6 prop, try a prop with 1" more pitch and 1" less diameter.

3. Excessive dihedral tends to make rolls barrel out. You may need to use rudder along with aileron to increase the roll speed and lessen the barreling out.

4. Holding elevator during the roll will get you a barrel roll every time. You must release all the up elevator before starting the roll. I teach rolls as a "By the numbers" maneuver. Step 1 is to raise the nose slightly, then release all the up elevator. Step 2 is to add in full aileron and hold until the roll is complete, then release. Step 3 is to use up elevator to bring the nose back up to level flight.

John Buckner: Love the anhedral on your trainer. I've been pushing anhedral on high wing planes for years.