plans and schedules are all finen and good... but the health of the plant in front of you is what matters.
so, follow the schedule, take notes of timing and proportions of products used etc... observe... take more notes, if necessary and adjust the schedule nex ttime, if needed (as well as any on-the-fly adjustments for this particular grow) ... systematically work it out. There are far too many variables to expect every garden to work exactly the same... if you have the same products, same soil, same blah blah blah, sure... it can be very similar.
I feed pretty heavy in vege. By the time i get to third week of flower i need to drop my nutes 30-40% or else i get extra lush, over-fed plants. The schedule is the first step. the next few steps involve you ironing it out.
if the flores a+b still provides 70-80ppm of N, it's probably fine. if it's much lower, i'd delay switching..
depends on level of nutrients which you can calculate and get familiar with, but difficult to memorize the 50,000 products out there. In soilless/hydro, strongly suggest you track ppms of each nutrient. This is far more intuitive and useful information than EC in regard to managing fertilizer. EC is still very important to how roots work, so that still has to be managed. Good feeding usualyl goes hand-in-hand with proper EC and pH, so it should follow suit when you get things worked out.