Forget everything else, if you fly the
attitude you will fly the steep turn. The key to the turns are quite simply attitude.
So eyes out the cockpit and use
LOOKOUT ATTITUDE INSTRUMENTS
On the instruments use B.A.B or Bank Angle - Altitude - Balance.
Lookout - Attitude - Bank
Lookout - Attitude - Altitude
Lookout - Altitude - Balance.
So the instruments are just being used as a guide to what's going on, BUT you should be able to cover up the instruments with a map and fly 45° turns by using JUST the attitude.
As you are sat on the left if you do a left turn then the right hinge line should be just about on the horizon, if you're in the right turn your left hinge line should be about 1" below. (all specific to seat height of course)
So to reiterate -
fly the attitude 