yeah, I use brewzor for a lot of the calculations I am trying to make when I am at the LHBS or while brewing.
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It's easier if I just stick with my favorite local places (alphabetically).
Since you think some are fine and others don't have enough carb, it sounds like it could likely be a problem with evenly distributing the priming sugar. Normally, one boils the priming sugar in some water, cools it, dumps it in the bottling bucket, and then racks the beer on top. This usually mixes the sugar pretty evenly but, depending on the racking, maybe not. Also, it's a good idea to gently (don't want to oxygenate) give things a little stir while you're bottling. Is that your process? or are you doing it a different way?