Can you confirm that these were your stress test transactions mined in all 32 Mbyte blocks?
https://memo.cash/post/61ef3de2ac2dd0c26ec1cf3e7061bb0a17a02bff66e3d29f3e7da5847a82faa4
What I know is that at this time I was sending almost 1.6 million transactions... Maybe I have some in these blocks!
No, op_return increases the price of the transactions and doesn't prove anything IMO, anybody can send transactions with the same message, what does it prove?