What you are doing is giving up your time for others. If you don't do that then unsurprisingly the farmers will use the increased productive technology to stop

What you are doing is giving up your time for others. If you don't do that then unsurprisingly the farmers will use the increased productive technology to stop working on Tuesday rather than working the rest of the work to keep you in 'leisure'. Ultimately you don't know how to farm, so you need the farmers working a full week. Adam Smiths rules of specialisation still apply. You need to give up your time so those you rely on to produce stuff will give up theirs. Or they won't bother.