That doesn't sound right. I've never read an '07 manual but have never heard of that before. My bikes have run fine from around 10 to 100 deg F, same 36:1 Amsoil Dominator premix, minor jetting changes. I never even needed to block one rad off. Kent A rides all winter in Sweden and has no problem either.
Does it bog/surge hesitate, or blubber hesitate?
What do you mean by "antifreezing liquid"?? If you mean a fuel additive like ethanol to absorb moisture and prevent fuel line freezing in automobiles, that could really lean your jetting out in addition to the cold. You shouldn't need that as long as you use known good fuel.
My guess is your lean on the needle, maybe boarderline lean when its warm so it feels worse when cold and possibly compounded from your fuel. The carb circuits have more overlap than you think.
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