That tank has high light intensity, where good CO2 is essential to meet the needs of the plants. Before you get too involved with figuring out all of the details about fertilizing you should work to get the CO2 ppm up as high as you can without harming the fish. Use the drop checker to get a starting point, then slightly increase the bubble rate, wait a day, watching the fish to be sure they don't cluster at the top of the tank, lay on the bottom, or show other obvious signs of distress. Make sure you have some water surface rippling to keep the oxygen content of the water high, so the fish can handle the CO2 better. While you are doing this, just follow the EI dosage recommendations. When you finally get the CO2 set right, if you want to use the pH controller, set it to the tank water pH that exists when the CO2 is set right. You should get lots of pearling within an hour or so after the lights come on if the CO2 is set right.
The EI method is about having non-limiting amounts of all of the nutrients at all times, so none of the plants is limited in growth by a lack of any nutrient. You can dose every day, every other day, 3 times a week, even twice a week. Just adjust the dosage amounts so you are adding about the same total per week as with the 3X per week the table is based on. Then, once a week (approximately) do about a 50% water change to get rid of any excess amount of any of the nutrients. If you miss a water change and go 2 weeks, that isn't likely to be a problem. If you have a lower plant density, try dosing half of the recommended amounts. The exact amounts to dose isn't critical.