If you are using the 2-part Sensi or Connie nutes then you do need to use both parts to get everything your plants need to thrive. I used the Connie years ago but went back to the 3-part AN nutes as I like to experiment with different mixing ratios for the various stages of growth and the 2-part is not very flexible.
Your ppm seems really low. Aim for 350 of actual nute ppm. Subtract whatever your water ppm is from the total so if your water is 100ppm then your total after adding nutes should be 450 or so. Those should be pH Perfect nutes so DO NOT try adjusting the pH or you'll screw up the technology. I gradually started doing DWC from clone to crop without ever changing nutes in tubs and that worked fine but that was after many grows and hundreds of plants. You do not have to change nutes in veg and doing weekly changes is a waste of good nutes. Just up the ppm as the plants get bigger and demand more. If using hard tap water then change nutes after adding back as much water as your tank holds to prevent minerals building up and throwing everything off. With RO or distilled water then don't worry about extra minerals.
I just root my clones or start seeds in screened ProMix HP. Soilless mix only as soil bacteria leads to root rot in DWC.
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Then end up with something like this.
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When first starting I would suck up some nutes with a syringe or turkey baster and soak down the net pots until roots emerge from the pots. Water level 1" from the bottom of the net pots.