Well, if Google is cheating on you, you can cheat Google back:
This is the user-agent for pageSpeed:
“Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/536.8 (KHTML, like Gecko; Google Page Speed Insights) Chrome/19.0.1084.36 Safari/536.8”
You can insert a conditional to avoid serving the analytics script to PageSpeed:
<?php if (!isset($_SERVER['HTTP_USER_AGENT']) || stripos($_SERVER['HTTP_USER_AGENT'], 'Speed Insights') === false): ?>
// your analytics code here
<?php endif; ?>
Obviously, it won’t make any real improvement, but if your only concern is getting a 100/100 score this will do it.