So I think I have the colors mostly alright for now and I'm trying to get that last bit of mostly squeezed out of it. The main thing that's stopping me is the gradients that add a nice touch on light themes (i.e. closer to black on white), but become more pronounced and distracting in a darker theme. Is there a package of gradients designed for dark backgrounds, or should I just get rid of the gradients?
The only way is to make your own custom gradients in photoshop or any other image editing software with opacity support.
The default one looks great on a bright theme but are not made for a dark style.