Hey Hudson,
I think in a situation like you are in, even if you decide to run some 'grow' into flower (using a 3-part nute for example), a week before you flush, you should stop using it altogether anyway. I would not use even a low level of 'grow' nute within 2 weeks of harvest, but you can keep giving 'bloom' at full strength right until the flush starts. You should be able to see the leaves getting paler and slightly yellower after a few days of heavy flushing. That is desirable.