If you're getting 'holes' doing the heel, try a
fish lips heel. I've been knitting socks for quite some time, but this heel, combined with the 'German short rows' method (good YouTube videos on how to do it) of doing the 'yarn over/wrap stitch/double stitch' is now my default heel, as it is so simple and so neat and tidy.
I spoke about it at WSD Guild the other day and no-had heard of it, or German short rows, but they're both simple, excellent techniques.