Based on your
PoolMath logs, you need to focus on keeping your pH and TA in check.
If you were to do an acid wash and continue to allow the large pH and TA swings, you will encounter the same issues again.
Looking at you most recent PoolMath log from 5 months ago, it isn't really possible to have a TA of 30 and a pH of 8.5. How did you accurately measure a pH of 8.5. Also, with FC greater than 10, your pH will usually show higher than it actually is.
Review the extended test kit directions. Be sure to take the TA and CH tests to their endpoints.
Many stop adding dropss on the TA and CH tests before the endpoint is actually reached.
www.troublefreepool.com
If this was my pool, I'd choose option one of the three that
@PoolStored posted in post #4 - and I'd test more often, focusing on keeping the pool closely aligned with TFP recommended levels.