Hi Brent,
Going astern with any long keeled yacht is not easy. You need to hold the tiller very firmly, or it will snap to full lock. Do not use much power, just go very gently. The best way to learn the characteristics of your boat going astern, is to practice in open water , using a buoy as the target. The type of propeller also makes a big impact. I have a 4 bladed feathering prop, with a very fine pitch astern, this makes backing up a lot easier than a fixed prop.
Regards,
Bill.
Aboard yacht JENAIN.