There is nothing wrong with overdrive. Its awesome I use armour si instead of rhino skin and hi brix instead of bud candy plant success instead of voodoo juice bud I do use sensi grow A&B and bloom A&B .as base nute.bud igniter.big bud ,nirvana.bud factor X sensizyme for bloom and quality and...
I would stick with a two part base nute.as far as root rot not sure if your in soil or Hydro but if your in hydro keep water temp bellow 70 degrees if posssble .there is alot of nutes for root promotion. I use them the first few weeks of veg and first few weeks of bloom