If my plants were six weeks into flower here is where I would be #wise

RO Water.........15ppm
CalMag....300ppm
Pro Bloom 350
Hydroplex.350 (these are both blooming nutes and together equal 700ppm)
Liquid K 7ml/gallon
Sweet 7ml/gallon

and my numbers would be about 1350 total. Your entire ppms are too low iimo.....especially for six weeks in.