So I think I figured out why my feeding gets so out of whack after about 2 months, Im starting to wonder if Im keeping my ph probe stored improperly. According to apera if you use it regularly you just need a drop of tap water in the cap to keep the bulb moist. Im thinking I might just start storing in kcl solution all the time. I recalibrate once every 14 days, just to make sure that Im as accurate as possible but for the last 5 or so my high point 10.01 never gets close, usually stabilizes at 8.9 to 9.4 and I think that's because my probe is already damaged, or maybe the calibration fluid went bad. The other 2, 7 and 4 always stabilize within .3 or .4 but the other is ALWAYS way off and I think that's messing up my readings and making everything slightly more acidic than I think it is.
Edit:
After doing what feels like a fuck ton of research. I figured it out, I think its a combo of a slightly dirty probe, and my 10.01 calibration fluid is expired. Even calibrating 2 point the 10.01 reads no higher than 8.8. So thinking that my probe was reading right, and it was that far out of calibration I set that ph as the high set point the last 4 calibrations. According to some of the formulas I found just that one set point being off that much causes things to read far more acidic then they actually are. Also the further you are from that set point when testing, say a more acidic solution like nutes the further off it will be. I plugged some numbers into a fancy calculator that I found and with the low set point and neutral being spot on and the high being 8.5, a solution reading 6.5, is actually a lot closer to 7.5. So there lies the problem, from now on since I know my 2 point calibration will be accurate I will only be using 2 point calibration.