As far as maximizing bud size potential?
In an 8 weeks flowering strain, Tissue Analysis says its beneficial to gave a boost of MPK... 0-52-34 in weeks 2.5-4, and then a Magnesium/Sulfur Boost in weeks 5-6, and then cut back nutrients in weeks 7-8, but do not completely cut of nutrients.
Flushng is a myth, as is cutting Nitrogen in flowering. Weed needs an ever increasing amount of Base Fert all the way up until the 6th week in 8 weeks flowering strain.
Weed also like 2x the amount of Potassium vs either Nitrogen, or Potassium. Some strains also benefit from extra Iron, but isn't the rule.