Nail biters are the worst to work on, like Noreen says you have all of the worst traits to start with and have to try to make them look beautiful AND hard-wearing - it's a thankless task
Your best course of action is to do the nails and then get the client back in no less than a week later to do some refining. By then they will have grown just enough for you to redefine the side walls and narrow them down so they don't look so wide (super short always looks really wide), you can also remove any of those almost imperceptable lumps, rough edges and potential 'nibble' points (they are there, trust me, I'm a seasoned nail biter, I can find any spot ripe for a nibble!) You can re-educate about Solar Oil use and stop any potential problems in their tracks. Then book in for religious 2 weekly appointments, leave it longer and the whole set will be gone
Whilst it can be totally disheartening for us Techs to product less than (to us) perfect nails, nail biters are usually so overwhelmed by how lovely they look they are eternally grateful, and that soothes my perfectionist heart
. And if you manage to get them to kick the habit and have great nails it's worth a million dollars to your self-esteme