@420loss yes you can as that ratio will still provide the needed nitrogen your plants will be using during the stretch period
some people will incorrectly tell you that they don't need nitrogen during flowering but yes they do
so to once again answer your question - definitely start to feed them your above nutrient schedule and good luck with the coming harvest
Definitely, I would also add something such as demon nutrients - sugar, to increment the ingestions of these sweet nutrients. Also check for palm ashes or oat ash as they provide lots of P K ! All bio!