High PPM in runoff in soil. Any advice or help welcomed

Im a novice grower on my second outdoor grow. I have 4 plants in 25 gal smart pots. My soil was amended with my own compost. Early in veg no nuts given. About 30 days in started with light feedings once every 10 days or so (400ppm). Slowly ramped that up. Im in week two of flower (light dep) and fed once later week one of flower at 880ppm. Im using advanced grow,micro,bloom and tiger bloom.
I haven't been watering of feeding to runoff as its been wet and rainy so ive been giving smaller amounts of water when feeding.

Watered today to runoff to check ph and ppm. Two of my girls came in at 1500 and the other two came in at 4000 and 5000. Not sure how they are so different or what to do from here. They look great. Maybe just continue with water on the teo that are high for the next little bit?

Ive built a makeshift hoop house to control the rain water so i am able to water until runoff from here on out.

Any advice is welcomed. Thanks
 

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