As a side note having balanced quite a few screens I recommend doing the following if you are able to even if it does seem a little extreme;
1. Enable grey balance calibration in the advanced tab of the Spyder software preferences.
2. Calibrate in complete darkness, no lights and curtains drawn, do it at night if that is easier. I have found that any strong light can make a small but noticeable difference to the calculations.
3. An obvious one but I still forget make sure automatic screen dimming and sleep timers (screen savers as well) are disabled or you'll just have to repeat the process.
Initially you may feel the calibrated result looks wrong but if you just stare at the screen for a few seconds you will be amazed how the human eye adjusts to even the smallest tonal differences. Give it a day or so to trly settle in and you'll be off.
Hope that helps 🙂