Roy -You do pose a lot of good questions BUT I don't think that anyone can give you the miracle answers your looking for. I just want to focus on this one statement above. You'll probably never get your algae issue fully under control AND for you to even begin to do so, IMO, you need to purchase more plants and lots of them. Fast growers like Wisteria and Ludwigia and the like. These plants in effect become your nutrient sink. They can better out-compete algae for available nutrients.
Every tank that I ever started that I didn't fill with plants from the start, I've had problems with. If I jammed them full of plants from the beginning, algae was rarely an issue.
I understand that you want to balance your dosing and your lighting and substrate, etc., but start by getting more plants.
I would suggest daily "micro-dosing" cutting back on your lighting a little and leaving the substrate alone. Eco-Complete is an excellent substrate. If it's getting too dirty, It may be that you are overfeeding. That could certainly be a source of excess Phosphates as well.
Hope this is helpful.
Roy
I can see where you're coming from... You're basically making algae soak up less of the nutrients because of more plants. The thing is, is I don't want to purchase $100 worth of plants and then have them die because of improper dosing rates. Should I just purchase very cheap plants for now (like dwarf sibulata, or something like this) and work my way up? or should I just go all out now and then figure out the dosing rates?