They say that pH reads higher than it is at high FC levels. I think that is more because the test is skewed, than the pH actually rising in the water, but I could be wrong. In any case, I never noticed a rise in pH when I was shocking, more like a decrease if anything, similar to what you are suggesting.
Your TA and CYA are a little higher than recommended (TA moreso). which might lead to a natural lowering trend in pH, but again I am guessing.
I would monitor it, and if it drops further, take action to adjust it back to 7.2. Check again at normal FC levels (once shocking process is complete), and adjust again as necessary (back to normal 7.5-7.8 level for swimming)