Main things I didn't like about root excel were the price and staining the roots and the soup. Not in a bad enough way but when I stopped using it I didn't get any less roots either. It is suitable for rdwc though.
As you can see in
@Hot Diggity Sog 's thread he got good results with just aquaflakes and zone too. I used most of the H&G line (no algen or aminos) and while I got great results I found that the same goes for not messing up the clean aquaflakes soup with unnecessary stuff. Top shooter is tricky, the times it added more bud it foxtailed badly and seemed to extend the flower time.
Also usually don't need calmag, plenty of both in the aquaflakes already, it's complete.
Multizen is nice to have especially when vegging 4 plants for 1 bulb. Strong stuff though, high in N.