How important is runoff ppm

Hey guys, I decided to check runoff ppm last night just for the hell of it and it came out at 1870, which seems like a lot. The most ive ever feed the plant was around 1300 ppm The feedind I gave it yesterday was only 1050 ppm, the plant shows no ill effects, its in FFOF using H & G with drip clean. Should I make changes or keep chugging along
 
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