parallax

this is my 3rd attempt to receive any reply:

1. parallax
experiencing big problems with background images in custom sections with parallax enabled. i have been asking before, is there any image size/resolution that is optimal for using in custom section?

2. css
is it possible to change hover effect in custom section? i found a.hover in custom css, but how can you change link/hover effect under custom section.
in my case, i am trying to change the color/effect for link, which is defined under a.hover. but need to change color/effect in some custom section as color mismatch background color/image.

what is a better way to get help? ticket or here? i had been posting this almost 3 weeks with no response?