Is this MG defeciency?

one of my plants is showing mad signs of what i think is mag def. anyone wanna confirm this before i hit it with epson salt? mainly im asking about the 2 leaves higher. the lower one im fairly sure is from the phoshorus lock out earlier in the grow. still tryin to get that straight.

its a bit over 5 weeks in flower. its had various different ferts, jack classic, and beasty bloom, and bat guano/molasses tea. also it had some serious ph problems earlier. fixed that for the most part. water is about 6.4 ph watered when dry. temps are fine, as is humidity.

Magnesium deficiency usually shows V shaped leaves so I dont think so.
Could be too many nutes.

anyone else wanna chime in on what this is. or could be?

overfertilization...imo