After you turned them all to low did you notice less drops? Also, try uninstalling Geforce Experience and see if that fixes it. If you want to reinstall it just get the latest nvidia drivers. I have a HDD and I don't get drops that low so don't think an SSD with fix all of your problems.
https://www.reddit.com/r/GlobalOffensive/comments/2iyerx/psa_to_all_nvidia_gtx_770_owners_who_are_having/