Hey there Kansas, I gotta admit I donโt know why youโre asking about this stuff seeing as how picture perfect everything is right now for you. If youโre worries about the burnt tips , you might as well dial back the NPK just a touch , but if you donโt the plant will muscle through it as it grows anyway. Same with the cal mag, yes you always need it , but youโre already adding it. So donโt stop. The fertigation frequency is less important following the wet dry cycle correctly . And youโre doing totally fine. Hope this helps ! ๐