[Plugin: Speed Booster Pack] A few issues I can't solve

I am having a few issues I have been unable to resolve on my own or through any threads here.

The first is when my site loads you can see the barebones site unthemed with just text for a second or two while it loads. Not a huge deal but it does make it look a lot more amateurish so wondering if I can fix that without a speed hit.
https://gwmac.com/

Second is a lightbox issue. I used a RSS feed plugin called Multi Importer to add some extra news stories on a few categories. It brings in a small excerpt and when you click the title it opens ip lightbox so people do not need to leave my site to read the whole article. But now the lightbox is disabled and when they click the link they leave my site completely. Here is a sample page of what I mean where this is used
https://gwmac.com/georgia-news/

The third issue is speed. I am using W3 cache and followed the guide here. I am only using Browser and Page cache. Minify, database, and object are all turned off. I am using Amazon CDN so that is left on. I also use Customizr theme. This plugin increased my mobile score but decreased my Google desktop score.

Currently I have all options selected under general settings in Speed Booster Pack. I set compression at 70 and downloaded Regenerate thumbnails and redid all of them. All 4 options under “Still need more speed” are checked.

Exclude scripts from footer and deferred are blank.