From the looks of it the benefits are added nitrogen and phosphorous. I’m gone check to see if what I have has those supliments in it.
Yes I don’t flush as the last few 3 to 4 weeks of straight water cleanses the plant from anything and flushing to me is like stripping the plant of all it nutrients and then trying to put them back in the plants and keep it from stressing from deficiencies. I use ffof start to finish which from reading on it is PHed to like 6.6-6.8 range and I PH any food or nutes to 6.2-6.4 range before feeding to the plants. I don’t have any deficiencies now and didn’t have any on the last grow as I put nutrients in plant per foxfarm a feeding schedule.
I go by what the schedule says and I’m always on the light side of the full nutes feeding per gallon as that schedule is a recommendation. All plants are different and can’t don’t use or need all of what another plant will need. I try to keep everything basic and not get to fancy. I think you could grow finish to end in just the foxfarm soil just my opinion.