Additives for Lucas during flowering

Alright, so I'm pretty new to things around here and in general(as you can see this is my first post). I tend to use searching to my advantage, and keep pretty quiet, since I don't know much to help others with yet (and I don't want to look completely stupid). What I have been trying to find is a thread about adding nutes to the Lucas Formula (I've read alot of threads saying you're not supposed to add anything to Lucas but I also have read threads saying that people do infact like to personalise the formula a little bit) during flowering to get better yields. I know enough that I should flush completely the last two weeks, but haven't had much luck finiding anything at all about adding other nutes during flowering for increase in yield. So I hate to ask for help, but has anyone tried this or know if I can? Maybe my question is answered already on a thread I'm yet to discover that you guys know about? Help would be appreciated. Thanks

all i do is add FF Microbe Brew and Kangaroots for the root system.

I add Great White (the Whale one for hydro) for the roots. Thanks for the input ! Much appreciated