Welcome to the forum

Most of times playback problems are due to a bad burned media, and most of times this is due to a low quality disc.

Sony discs are not exactly the very best, and often gives a lot of errors after the burn.

What burner do you have? Did you installed latest firmware available for that drive? At what speed did you burn these discs?

Do you have a reliable burner to run a quality test of your burned media? For example a Lite-On burner.

About the settings in DVD Shrink, I suggest to disable both settings and save the shrinked files as ISO on your HDD first, and then use any burning software to burn the ISo on a disc.

To change booktype you can use ImgBurn, but also nero should allow you to change it