I've used this code to change the color of the font of the Nectar caption, but I can't change it beyond back or to any other colour, even after clearing my cache.

body .swiper-slide .content p {
    color: #f00 !important;
}

I also can't change the line-height under the Nectar/Home Slider Caption Font in Typography.  

It would be great if I could have control over the color, line-height, and top-margin for the Nectar caption.

Disregard, this code did the trick.

body .swiper-slide .content p {
    color: #ccc !important;
    margin-top: 24px !important;
}