I've never tried the Layout Tester, even though my Ezoic account manager thinks it could double the income I'm making from the Ad Tester.
But if Layout Tester is anything like Ad Tester, it takes a lot of patience to wait while it gathers enough data to optimize. My Adsense income continued its downward trend for several months after I signed up for Ad Tester, to the point I was ready to pull the plug.
Lucky for me my account manager talked me into giving Ad Tester one more month before I made a decision. It was that next month (November 2016) when Ad Tester really started paying off, and has continued to do so. Last month I nearly tripled my ad income from a year ago, and my traffic hit an all time high.
Not saying that will happen for you. Just wanted to let you know that Ezoic has proven to me that they want to double or triple our ad revenues as much as we want it. We just have to be patient enough to let the testing run it's course, and not get hung up on what we as site owners like and don't like. After all, it's what our visitors like and don't like that matters -- which is what the testers will eventually figure out.
But I will also tell you to not be shy about expressing your fears and concerns to your account manager. As they say, "The squeaky wheel gets the oil." My account manager will be the first to tell you, I was a very squeaky wheel!