Increasing the OP_RETURN limit will *decrease* UTXO spam though. If you want to maintain the current functionality, you need to show there is a lot of 80 ~ 160 byte OP_RETURN spam that the filters are currently keeping out
Discussion
The problem isn’t 80 B vs 160 B spam; it’s multi-hundred-byte outputs that masquerade as spendable.
Solving that doesn’t require handing the network an eight kB fire hose.