PoolWaffle, why not end the "Sunday push" method? Instead, implement a "6 day no-hash push". If a worker is hashing for any given time but doesn't connect to mine after 6 days, it's earnings are pushed to the worker.
That way you are not losing transaction fees for miners who are still hashing on Sunday and still will be on Monday. The push should be for a worker not active on WP for 6 days straight.
This way you can raise the fees to 1.5% for a few weeks along with the 6 day delay (or however long you feel is a good time frame) and see if it measures out to the 2% you originally planned. Plus, you just might gain a few more workers who want the stability of a well-run pool with the added benefit of low fees.