In the end quality sort isnt working. For whatever reason default its sorting for quality and what it kills it completely was, that the directory listing changed the order if you put an item into the bank (or sold it etc.) A changing directory, where you have to check with every click on E what youre going to sell, is just too much effort.
The whole purpose of this thread is to make it simpler in such situations, not more complex.
You could use FCOItemSaver.
Once you marked your sets with a marker icon (5 gear sets as standard + up to 30 extra dynamic icons you could also use as gear sets, wich your own names, icon texture and protective functions so you do not accidently deconstruct or sell your precious items) you can use the 4 filter buttons at the inventory bottom to hide the items with these marker icons.
This will remembered for each panel (inventory, carfting station, bank withdraw, deposit, guild bank, house bank, mail, trade, vendor, ...) individually and also protects your items.
It needs time to setup but also integrates with other addons like AdvancedFilters UPDATED and FCOCraftFilter, DoItAll so you are able to hide/show/only show items you like to see, and even mass deconstruct/mail/trade/extract glyphs where marked items are protected.