What can I learn from my runoff?

I just flushed my purple kush in 3 gal pots.
promix
They were just entering their third week of flowering and I amu just switching from veg to bloom nutes.

The collective run off of 6 plants was tested with my tri meter.

Water in, ph: 6.3, ec: 358

Run off, ph: 5.93, ec: 1410

I collected about 5 gal of run off from 6 plants.

I would like some advice on what I can learn from these results.

Thanks
Famine