Are you dosing half the two day amount each day?
I wouldn't mess with the EI plan, apart from ratios to balance each particular tank, as some smart cookies have refined it over a few years and it's pretty well optimized. You're meant to keep your micros, specifically iron, separate to your phosphate day, as phosphate reduces the iron to a less usable state.
Have you tested your nitrate and phosphate levels? Could need less macros rather than more. Does vary depending on how densely planted, and with what, your tank is. Make sure your CO2 is at good levels, and stable. And yeah, more flow could help.