I have noticed that my bike runs very smoothly and more powerfully in the morning as compared with late in the day even if temperatures are similar. I too suspect that the humidity is the key factor here. Not to confuse the issue of the ECU maps...
I just went out to run a few errands and had to start the bike cold. It felt like it was idling a bit rough and it almost died on me again while entering a street. It's feels like it is reverting back to the stock behavior again. Not good. The temps have dropped about 40* here, but no humidity here in Phoenix.
At cold start my bike is a little rough as well. I let it idle for a minute or so, then for the first few hundred meters I'm careful to apply enough torque to the traction. After that it's smooth sailing. Was you bike running erratically once it warmed up? Have you ever made modifications to the green settings in the EJK? You may want to increase the setting a tad for wintertime. Could I ask you a favor, could you write down the stock settings of your EJK?
I've not changed any of the settings. Yes, it does behave fine once it is warmed up. that's something that happened without the EJK as well. Once it's up to temp, it ride fine. How do I get the stock settings?
Just press the "mode" button repeatedly and the EJK will go in rotation and light up the current green, yellow, red, blue-green, blue-yellow, blue-red settings. Do not press any other button, just the mode one.