With additions of pool chemicals including muriatic acid, it is always best to do several small doses rather than try to get to your target in one dose. This eliminates the concern about overshooting the target. Plus, if you start with a small dose, you'll be able to tell how much it affected your pH and then you can adjust the next dose some of you need to.

Using your eyeball aimed upward to create as much rippling as you can should be effective at aerating. Or, you can rig up a fountain or get all the neighborhood 10 year-olds to come and spend the afternoon playing and splashing in your pool! Actually, your return jet eyeball will be fine. You'll be surprised how well the procedure works.