Growing is life
Yea, I do something really similar, I maintain my same exact (veg) ppm formula going into flower, but increase (light) intensity going in, and though that phase, trying to supercharge it, I'm really hyper focused on budding setting at that point.. It's a really critical phase of development to get it right. Usually bumping up my light intensity as I go along, then somewhere around day 10-14, I start ramping up Phosphate. Always keeping some mag/sulfate foliar handy during the interim.What I would do is increase the light by 20% or so and simultaneously decrease food by about the same, the day you flip., then slowly increase light and food to max by the end of stretch.
That first week or two after flip is where where inexperience can really nail you; the plants can get N heavy, if you don't watch out. Or mag/sulfur/calcium start getting out of line, cause of changing needs. It's the phase where leaf color, leaf notching, position, praying really is telling us a whole lot.