I generally give each trace equal weight per ml.
This is a safe assumption as the amounts dosed are all in excess of plant needs.
If I use 20mls on a 120 gal tank, 3x a week, that will supply enough for most any light, stocking fish load level or plant biomass.
I also assume that excess traces do not induce algae, I've never found evidence for this in testing, neither have many other folks in the local and international plant growing clubs.
So while they are not all equal at a base level, at the range I suggest, they are nion limiting to plant growth in all cases.
This is wasteful to some degree, but there is a very easy method that also does not involve test kits to reduce the amount need to match your individual light, plant biomass ansd type/species, and other factors.
NO3, K, PO4 are all very cheap by comaprsion, but this same method can be used there as well if you are interested in providing "just enough". This method of "just enough" works best at lowering lighting.
It is erronous to assume that just enough is the best model for dosing, it's not.
Regards,
Tom Barr