Normally, you do whats called a triple evacuation. You vac down to a set micron level, add an inert gas, repeat, three times. (Last time don't add the inert gas). I bet you still have moisture and such in your system. The filter will remove basically a single drop of water, and remove very little as far as particulates go. It's rated to remove any excess from a triple evacuation.
EDIT: Your way undercharged right now too. What refrigerant are you using?
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