"Before touching a thing, stick a manifold gauge on there and find out what's currently happening with your pressures!"

READ THIS, AND THEN READ IT AGAIN, then DO IT. Until you can look at the gauges and read the pressures and temperatures, you are guessing. If it's 110F outside, then BOTH sides are going to be a little high, that's how gas pressure works. If it's high on both sides and it's not hot ambient, the gas pressure is too high... overcharged. At least you have some leeway on a Benz system. The Toyota I worked on recently was 14oz, TOTAL, +-0.2oz.