I'm a continental knitter and depending on what yarn I'm using, my purl stitches are looser. What I do is, I wrap the yarn one extra time around my pinky when I'm purling. So if I wrap it once when I'm knitting, I wrap it twice when I purl. This does wonders to even out my tension.
I'd say, stick with it for a little while, but if it doesn't click, then don't sweat it. :D
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