Check this out. This is MiracleGro Tomato, two weeks after 12/12:
View attachment 3586163
That's squeezed into a 2x2 area, but plenty of headroom in a 4' tall space. (She's a fat girl.).
I would encourage you to try it again. Just follow what I did, it looks like it will work (unless somethings about to go wrong in flower.).
I was having some N-toxicity because I was looking for where burnt tips occur (so people would know what the limit is). I was feeding 3.6 to 3.8g/gal. I was beginning to back it off at the same time 12/12 started, but was afraid to introduce a variable going into flower (in case there were deficiencies). Then
@DarkWizard021 said he grew with MG Tomato previously (and is starting again), and that he fed 3.0g/gal.
All that new (12/12, stretch) growth was in the 3.5 down to 3.0g/gal range.
I hate to be the MiracleGro shill.

But, seriously, if you had troubles with it, I think it would be better to try it again following what I'm doing, get some skills playing with that, then adopt something else.
My concern is, if you do some boutique, multi-bottle "lineup," you're still going to face the "dialing it in" challenge. Having just one product seems easier to me.
(I would do my soil too. I think that's a large part of it also.).