You can use whatever you want, as long as the plants don't starve. I see no reason to change what the OP is dosing. "PPS-PRO" is just another ripoff of PMDD and EI and was renamed/reinvented from the original scheme "PPS" when it was discovered that PPS was severely flawed.
PPS required it's acolytes to measure water column nutrients feverishly and to follow some bonehead schedule of nutrient concentration values (ppm) from a spreadsheet. It was an exercise in absurdity.
It required that you keep the measured nutrient ions between some minima and maxima concentration levels. Since no hobby grade nutrient test kit is accurate or consistent, users of the scheme suffered one Perpetual malady after another, while others, randomly reported success. It turned out that the ones who couldn't be bothered to measure and just dumped the nutrients into the water, or, those who lived in agricultural zones or otherwise had tap water high in nutrient runoff, were the ones having the most success.
In my post I go into further details regarding the limitations of the original PPS:
http://www.ukaps.org/forum/threads/pps-pro-and-high-nitrates-in-tap-water.27332/
Now, looking at the propaganda in that recent link you provided, I see they specifically state:
"Testing: We do not test for water parameters on settled aquariums. There is no need when levels become consistent.."
And, of course, for over a decade, EI users have known that you've never needed to test.
So I don't see how this "new" revision of the dosing scheme is any different than PMDD or EI. They are using exactly the same ingredients as PMDD/EI but the quantities are different. So why bother? EI allows you to dose different quantities any time you want. Why market something that is already available to you and then call it something different? Where is there an advantage to the hobbyist?
Cheers,
