You may also want to try adjusting the angle at which you wipe. Always wipe front to back, never pushing towards your vulva, but beyond that? If you stick your hand between your legs and push backwards, you might be missing stuff. Reach around you and go between your buttcheeks that way. Standing up and even spreading your cheeks should also help.

And finally, if you sit on the toilet in such a way that your cheeks are pushed together, that will smear things around. Can you adjust your cheeks to be more spread while you're on the toilet? That's made the biggest difference to me.