I've been using all of the flourish products aside for iron, phosphate, and trace.
I definitely plant to dose phosphorus and iron because I think my plants will benefit from them since they are macros. However, trace is micro only version of comp, will it benefit my plants if I use this with comp or will it not make a difference?
You should use Flourish Comp with Flourish Trace. If you don't have it, I would get it.