Did you ever try wearing mechanics gloves.......works well for me.
I am not a glove guy I want to be able to lay my fifer on the line so I can feel what is going on down below better. If I use anything to keep my hand warm it's something that Sportsmend Direct sells made out of fleece I can't remember the name right now. I will have to go in there site and see if I can find it.
On the question of isnt metal (most commonly aluminum) and graphite ie carbon the same temperature if your out fishinh on the ice .
this is really easy to explain with the simple idea of thermodynamics and the dissipation of heat from a material. Aluminum is often used in making of lead jigs because it is able to shed heat from it very quickly and rapidly compared to other metals. So what that means to us that ice fish is that the heat from our hand will go into aluminum and leave it very rapidly therefore making our hand colder faster. Basically it pulls heat from your hand.
With graphite i.e. carbon reels it retains and holds heat better then aluminum therefore helping keep your hand warmer longer in the cold.