Yeah. I'd stick with 30g and add 10g top dress if they aren't clawing or burning 2-3 weeks in.
Really, a very large 7-10 gallon pot with 10g per gallon is probably the best way to get start to finish with enough charge but not too much to burn the plant but that's not the most feasible option for average auto growers.
I think my mistake was too heavily amending it with the 3.0 at the beginning. Was a hair too much until the 3.0 ran out, then it was slightly under fed a hair. Bottom watering REALLY helped at the end. Obviously there were some hidden fresh dots in there still.
Bigger pot seems logical. When I can get my hands on some dots maybe I will try that and do a journal. One as you suggested with the top feed and maybe a 5 and 7 gallon and 10 with the 10gms a gallon.
One more for you if you would be so kind:
You seem to be fan of Winter Frost. Do you use it as directed? I looked into it a little awhile back and was interested in the claim that it would make the plants finish at the same or very similar time. Have you noticed this? It seems that senescence would be some form of chemical reaction in nature that could be replicated sythetically....What other effects have noticed?
Thanks man!!! Really appreciate the sharing of knowledge!!!