Spray everything. flowers should not exist when you start spraying. If they exist, you are already too late. It still may produce soem male flowers, but it's less than optimal as far as timing. Start spraying when you flip to 12/12. That is the proper starting point. You shouldn't have to spray it for more than 10-14 days with cs?
Look into Silver Thiosulfate (STS). Sigma-Aldritch has a recipe online (link below) for it that isn't an amateur's guess as to ratio of chemicals used to make it. You need to dilute that recipe a further 1/6th or 1/10th (20mM to 2-3mM concentration).
The benefit is that you only have to spray once every 5 days for a total of 3 applications. It's also more effective than CS.
Buying CS is a crapshoot. All those holistic health brands lie about ppm. what can you expect from people that drink it? Bwahaha, some fools drink CS "for their health" bwahaha.
Anyway, silver nitrate and sodium thiosulfate are cheap on Ebay. a 10-20 USD will make you gallons of spray you use maybe 30-40mL per plant? So it'll last years. Cook up small batches as you need it.
https://www.sigmaaldrich.com/US/en/technical-documents/protocol/cell-culture-and-cell-culture-analysis/plant-tissue-culture/silver-thiosulfate
Remember, that needs additional dilution from 20mM as instructed down to 2-3mM. Algebra is your friend. Do not try to change the recipe to skip this step. In order for the double-replacement reaction to occur, you must follow the instructions in a proportional way. You can downsize to 1/10th the mass and volume of water used. If your scale is .01g +/- .03g, you'll probably make a bit too much, but it'll still be cheaper than buying it pre-made or individual stock solutions pre-made of the reagents. With dry ingredients, you can make a small bit at a time and it'll store on a shelf forever relative to our context. The pre-made stuff needs to be used immediately and the stock reagents mixed up have a 6-month shelflife (silver nitrate and sodium thiosulfate dissolved in water needs to be used within 6 months ... STS once mixed needs to be used immediately.)