COCO should NOT be fed less frequently. Its hydroponic medium and should be fed nutrients min every 24hours for best results. It should not be treat like soil as it is nothing like soil. Coco holds more O2 in the rootzone which is the first reason coco plants grow faster than soil plants.
Also do not water to run off, its completely unnecessary. It leads too poorer root development. Little and often is the key to success in coco. Example, if you use a 20litre pot a flowering plant with good roots will take around 3 litres of feed daily with zero run off , give or take depending on the size of the plant.
The only time to have run off in coco is for the final flush and if you have overdosed with nutrients.
Now if you have a higher perlite to coco ratio then you would feed to run off as the coco dries out much quicker but then you would want it on drippers or flood tables for multiple feeds.