When do you adjust your PPM?

So I run and 4x4 ebb and flow table with a 40 gallon reservoir. I raise nutrient concentrations every week in flowering by 100 PPM. Some times after raising my PPM level, for the next 3-4 days ill see a 10 ppm daily raise (ie day1 300 ppm, day2 310 ppm, day3 320ppm). I take this as the need to lower my PPM, so ill drop it back down about 50 PPM usually.

It got me to thinking, 10 PPM isn't much and the plants don't show any signs of burn. How big of a change to your PPM levels before in your experience it is necessary to make a change? How much do you lower your PPM levels?

All ppm is hana .5 conversion

600ppms start to finish.. no flushing

not enough posts to edit: .5 convo

iffey said:

600ppms start to finish.. no flushing

Click to expand...

that sounds about right

With a six plant perpetual the nutrient EC differs depending on how long the plant has been budding. The four reservoirs range from .4 to 1.4. The final few days flush is done straight out of the water jugs.
The EC is checked each watering but in general it will last three days before the EC changes more than .3 and needs adjustment.

Many years were spent using a single strength solution throughout the grow cycle. Not a lot of difference but enough to make the bother worth it.