hummingbird brought score drastically down

Hello, we got our site "multitable.com" up to an 85% from the website speedtest: https://tools.pingdom.com/#!/0hjQJ/https://www.multitable.com. What is odd is that after installing Hummingbird/WpSmush Pro and configuring all the options, the score went from an 85% down to a 64%. Have you seen this before - what do you think are some common things that would cause that?

On another note, we've used this plugin on two sites now and the configuration for minification, I have found that it borks the entire site and I'm unable to use that setting.

I've read your "good support ticket" and can provide access but wanted to get your opinion first on something like this.