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A mask that fits perfect at the dive shop with no regulator in your mouth may not be the same in the water. The regulator mouthpiece can deform your upper lip and mess with the mask seal. Might try a smaller mouth piece I personally use the comfort bite mouthpieces from Aqua Lung or Apeks. I just learned to live with some water in my mask some days are better than others and now I purge without thinking about it. I think I went through 8-10 masks until I found the one that leaks the least and then bought three of them. Personally I don't like the FFM's they are too confining for me and the com part doesn't interest me as diving is where I can get away from phone calls, emails and talking!
My best-fitting diving mask remains the high-volume Typhoon Super Star my parents gave me as a Christmas present back in the late 1950s. Its leaktightness is due to the generous margin of the skirt resting on, and sealing to, the face, as shown in the period illustration below:
Very few of today's low-volume models seem to come with skirt edges capable of being similarly "unrolled" on to the face to achieve a perfect seal.