So sorry for your loss, @lmsmith27, your pics are heartbreaking 
There are more discussions on this forum but here’s one that includes a link to a YouTube video by Randy Oliver, an authority on varroa management:
I use oxalic acid sponges, made using Randy’s instructions. I place them on top of the frames early in spring. The bees walk on, chew and carry away OA-impregnated sponge bits over the the course of the season and in doing so, disperse OA throughout the hive. Very effective in my experience.