Trends Thus Far:
It seems the biggest trace elements that need constant weekly replenishment are the following:
Strontium (Sr)
Manganese (Mn)
Iron (Fe)
Iodine (I)
Vanadium (V)
Luckily I've been making my own DIY Trace elements and Amino Acids.
I also supplement weekly Seachem Reef Plus for components I do not have.