Let's try this at a different angle. I do not know how you are watering your plants volume wise. When I water I have a rule that seems to work for me and you may like to try it and see if it works for you also. I water by the size of the pot the plant is sitting in. A one gallon pot receives 1 pint of liquid every other day, a two gallon pot 2 pints every other day, and a 3 gallon pot 3 pints every other day, and so forth. Whenever I decide to flush I just double the amount of liquid going in. If the plants need any more than that they will tell you.
Now by doing this you are not going to have a lot of run off and you do not waste nutes by it running out on the floor...it stays in the pot where it belongs. If you are using so much water that you are having run off each time you water you are basicly flushing everytime you water. Maybe this is worth a try.