Growing organically I’ve left behind all that extra work checking ppm and run off and draining saucers and PHing everything and on and on.
Get a turkey baster or a little plastic syringe type device like this…
Suck some of the run off up and transfer to a small cup to check your readings. Only issue is that without cleaning the saucers after each run off the salts etc will build up and can skew your readings to the high side.
The numbers you posted seem pretty close to where you want to be during flowering…I think…lol
My run off ppm have been as high as 6000 ppm but again I’m growing with the old mama’s living soil so no worries there.
Maybe next grow you’ll come on over to growing the easy way…feeding the soil critters and not the plant via IV