I understand that you have optimized the timing. That is desirable.
I don't understand your tuning every few weeks for "weather" changes. Even if it was necessary, you could re-tune and the day following, temperature could be more different than the previous entire month. Thankfully it is of no benefit.
We have MAF and IAT sensors to help with this.
My car uses the same tune from -40*C to +40*C.
Years ago we tuned high-performance small engines quite frequently. Their carbs had no idea what the air density, humidity, or IAT temp was.
