no need to flush even if using "salt" nutrients. "Salt" in this context is an old timey word that conveys misconstrued message.
gas choromotography and other techniques has shown that flushing or not at end of harvest has no statistically significant impact on minerals found in the buds. This isn't even a debate as teh other side on this topic never did any testing of their hypotheses, and simply repeating it ad nauseum made it a commonly held belief that is very unlikely to be true.
flush when you have a problem and not whimsically so. No lockout? no pH djustment needed? no reason to flush. cause and effect. where as the purported effect of a pre harvest flush was made up mumbo jumbo of people that didn't know any better. It's okay. We've all been there.