Q: Ac has no vacuum

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My o-rings went out on the a.c. lines going into the compressor. So i changed them and thought i pulled a good vacuum. So i charged it, but then as i was going down the road it started loosing the cool. So i got to autozone shut off the car. Popped the hood and i could hear and smell the freeon coming out of the lines on the compressor. I attempted to tighten the nut but it only leaked faster. So i went home and changed the o rings to a different set. And tried to pull a vacuum again but it would only get to negative 21 and hold there. Now it wont even get to negative 21 its at like negative 15 or 18.

My car has 204000 miles.
My car has an automatic transmission.

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