I am not sure about conversions, so I will not speak to the volumes you've added. I'll speak to the process, however-
When trying to reduce pH / alkalinity, when adding the reducing agent (in this case- muriatic acid) it is most beneficial to add the agent while the water is calm to the deepest area. With muriatic acid, I'd dilute with water first. After adding, leave the water calm for an hour or more. This will yield the best results for pH / alkalinity reduction. I stress- This doesn't mean it won't work if you let the jets run. Just a more effective process is all.
Leaving the air on with your jets will also aid in pH increasing. Turning off the air (and thus leaving just 100% water running through the jets) should be something you can look into to help aid in your process.
Regardless- I'd concentrate on reducing your alkalinity first: When your alkalinity level is HIGH, the pH will creep up. The higher it is, the faster it creeps up.
Moving forward, lets say you added up all the amounts of muriatic acid you've put in over the past week or so. My advice is to total it all up and then add it all at once, via the method I laid out, and then re-test after a spell. Then, I'd write down everything you did, so you can refer back to it and know what the proper amounts, process, etc. to follow.
I hope this makes sense. Good luck moving forward.