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PH and TA..............Here is a link on how to lower you TA:
Pool School - Lower Total Alkalinity
You will have to do some tweaking for find what YOUR pool wants the TA at. Some pools like a TA of 80 some 50. Once you find the TA your pool likes your PH will become a lot more stable.
I would lower your TA to 90 and see what your PH does. If it keeps jumping up then push your TA to 80 and see what your PH does. It will take a little while to fine tune it.
Just know cannon balls and heavy rain will also push your PH up. Just keep that in mind.
Let me know how it goes and we will work on it together.