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DaveTheNewbie
Hey man, you persevered through the challenges and got the job done. In the end, you learned a lot from it and have more knowledge going forwards. Sounds like a success to me.
I hadn't run a recirc system before ppks either and had the same thing going on with the EC climbing. I found a good study where it was recommended for a no drain recirculating setup to have the EC at ~1/3 in your bulk reservoir of what you initially filled the system with. I'll try and find the link for you. Basically what happens is the water is evaporated or transpired by the plants at a higher rate than they use nutrients out of it. If you keep adding back full strength solution it will steadily grow until your EC is quite high and you have to add plain water.
Your next round is gonna be killer man!
i would like to hear more about this too as i have a rising EC issue. Not a bad one, but it is there.