Hey Eric,
The method used for the parallax effect in the V2 Section is different than the one used in the Classic Section. V2’s parallax is smooth moving that’s why if your image’s dimensions are not bigger than the section’s dimensions, you’ll not get a drastic parallax effect. Also, try increasing the Layer Size option.

The Classic Parallax also doesn’t currently work in Safari 13 and there’s currently no fix for that.
Regarding the custom codes, ever since, providing custom code is outside the scope of our support service. We’re sorry if this wasn’t made clear in the previous threads. All code you find here in the forum serve only as a guide. We do not support them.
The thing is, we keep on providing custom code in hopes that users will learn to code themselves if options are not available but it gets abused. Most just use the service itself and in turn, we receive a lot of outside the scope requests which is not good for you, our customers, because of longer response times and not to mention the frustration to both users and support staff for the problems caused by custom codes.
We now provide custom development guidance via our One service. You might want to check it out.
I hope you understand.