4400ppm in Soil Runoff ?!?!

I have 6 plants all less than a month old in 1,4L pots. After their first feed today, the EC meter showed a reading of 440 x10 on the collective run-off of the 6 plants. I've fed them a half strength solution of GHE Flora using just 2.5 liters of the 3 liters I've mixed with 0.4ml of each nutrients (approx. ratio of GH 2.5ml/10L).

6 Plants
Bio-Bizz Light Mix in 1.4L pots.
Fed with GH Flora to ratio .4ml(MGB)/3L
Ph In: 5.7/6
Ph Out: 5.9/6.1
EC In: 100 x 10
EC Out: 440 x 10

I've read that the EC run-off shouldn't really be a concern with soil, plus I've only mixed a really mild solution for their first feed and the soil is a light mix. But when i saw 4400 I thought I would ask some suggestions before flushing like a maniac for no reason. Any input would be much appreciated.
Thanks

RB

I wouldn't worry about it. I used to micromanage shlt that close but realized that if they look healthy then don't try to fix them. Keep doing what you doing.

this is why I've always been an advocate against run off for PPM. you get get an idea of your PH with runoff but the PPM with change dramatically depending on how much water you flush through.

so long as you've never given your plants anything that high dont worry.

Thanks for that!