Leaves tips turning yellow some brownish

EZ is right. it's a bit high in N... depending on how quickly it progressed it may only need a slight adjustment... the slower it occured, the smaller the adjustment necessary to correct it. leaves are dark but only slightly starting to curl down... you have time to be patient and slowly adjust to this. a plant cannot rid itself of excess building blocks (nutes). so any rate provided that is greater than rate used will result in a build up over time... the slower the build up the smaller the adjustment needed. you may benefit from an initial larger drop of N for an irrigation or 2 allowing the plant to suck down excess in leaves, then raise up slightly before canopy pales. waffle around that for a bit... apply what you learned this time to next plant and possibly avoid the whole game.