The seeds and soil etc don't really matter. Not much anyway, it's mostly the conditions and also what your neighbors are doing. There is such a thing as disease pressure, if more spores of something are in the air the more the chances of infection.
Rules against septoria:
one stem prune and good spacing.
morning sun, this is not to be overlooked, it can make a huge difference
some leaf prune if the plants are still too bushy
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