I don't worry about it.
Sometimes I'll do a back stitch to help shorten the distance between stitches, sometimes I stab stitch, but even these methods don't look the same as my regular hand quilting. It's not the end of the world if these stitches aren't the same as the others and a lot of times I just do my best and let there be space between the stitches.
Since I really like to hand quilt, I pick projects that have open spaces and not so many seam allowances. I wouldn't hand quilt a Bargello or log cabin quilt - to me, they're perfect machine quilting candidates. I did hand quilt a king-size Bargello for a friend, and it was torture!