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Aaron, first of all, good on you for giving it a go with a standard camera lens. Your processing looks good too and you have disguised the light pollution well. The funny shaped stars can be any number of things from camera movement to aberrations of the lens. It's going to be a process of elimination to find the cause. Here's a few things to try. 1. Make sure your lens stabilization switch is turned off. 2. Use your self timer setting to allow the camera and mount time to settle before exposing. 3. Try a shot with mirror lock up enabled. 4. Make sure your connection from camera to telescope is secure. 5. Try another lens. You've already established that stopping down didn't help so you've eliminated that possibility.
Apart from that, just keep experimenting, maybe even shortening your exposures to 1 min and upping your ISO to 1600 and see if that helps.
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