Browser Screen Flashes Between Slides

Occurring for me during the screen recording (show me) simulations because of the lag time loading.  This is when viewing with Review 360.  Client not happy.  Someone mentioned switching off the Modern Player and enabling the Classic as well as adding this code to the output.css 

'.load-container {
background: none !important;
}'

I will try to test this out but so far very worried about the final review with our client.  Between the jerky and jumpy simulation screen recording (sometime the action fine tuning doesn't work well), the occasional screens that black out, and the flicker (loading) screen recording slides, this will not look professional.  I almost wish I had used another tool to record and just embedded.  I certainly don't want to go back to the drawing board (no time)