If the water vapor is already frozen, a drop in temp isn't going to affect it. It can't be "more frozen". It's also not going to be as likely to adhere. Or, the filter will take care of it if it's large enough. Much like flying in the clouds when it's very cold. You won't be as likely to pick up structural icing because the water vapor is already frozen and just bounces off the aircraft.

A carburator does two things that cause a lot of cooling. Atomization of the fuel, and the accelleration accompanied by the associated pressure drop of the fuel/air mixture going through the venturi.

Air that's heated to 50 degrees can hold much more water vapor than the same parcel if it's it's only 10 degrees. Ever notice how dry your skin gets in winter or the fact that every thing you touch results in a static discharge? Same reason. This is why it's much more likely to have carb icing on a day with a 50 degree temp than a 10 degree day.

I was never a fan of the twin story. Too much circumstantial crap. I liked to keep it much more simple. Does the AFM say use it on T.O.? If not, don't use it. What about landing? Are you saying you do something that is against what the AFM says in its procedures?

Nothing says you have to go flying. In the same respect, if you think you have carb ice, don't force a landing unless you absolutely have to. Always have yourself set up for a go around if you can. Clear the engine first, then come back and land if it's not bad enough that it's an emergency.