Another lever that does not impact small groups at all and only impacts large groups is the culling or Rorquals. Limit them to 1 per resource field and limiting use of PANIC to active Indu Core. This makes it necessary to bring barges/exhumers to mine.
Small groups already mostly use barges/exhumers to mine because they are cheaper and easier to replace.
Large blocks doing Rorqual blobs, on the other hand, all of a sudden have lost a lot of their protection potential as it takes longer to mine and PANIC has to be used strategically. Locust fleets alleviate that a little bit but locust fleets of hundreds of barges are still easier to engage than locust fleets of dozens of Rorquals.