I think that that is the problem when you begin learning something new like this- you sometimes get methods and terms confused as you are learning a new vocabulary that others speak, yet you are still unfamiliar with.
Many times those that speak and know this language ( the experienced)-- and all those particular details that these terms refer to-- dont realize that what they understand in complex detail, the beginner is still learning the language of.
No doubt about that Discusluv. When I first got started, I thought some here were speaking in tongues.
So yes, it does take some experience. Getting to know and understand either Rotalabutterly or the Zorfox calculators are well worth the time.
In very general terms, PPS is light dosing designed to dose "just enough" (you can elaborate Edward), and EI is designed to dose "more than enough" of everything, so everything is non limiting.
Once again, that being said, in regards to EI, very few that I know actually dose recommended EI macro levels. Might be a little more or less of each compound. And then don't even get me started on micros! Also EI recommends dosing micros/macros every other day. Many of us are front loading all or most macros and dosing micros daily.
And dosing levels of either EI or PPS are all relative to your tank and your goals.
So the problem is, it IS complicated, until you begin to understand the terms/words/calculations. And even then, it takes some dedication and willingness to experiment to really find out what works in your tank.
Good news is many here happy to help with thoughts on both "EI" or PPS dosing. As always, the more detail you have about your tank, the higher quality advice you will receive.
Not sure what the OP intends to do, so very difficult to help.
I think the best way for me is the pps way .
Maybe it is, and maybe it isn't.
But in general, with a tank that size dosing dry macro ferts, either EI or PPS, is much cheaper and easier in the long run. I would not be making a macro solution for that dosing.