At your weight, I would run the lightest kart you have. I ran a 2010 Birel at Rock Island, and it is light weight for sure.
I ran extra gas for the purpose of weight. If you can, look for a smaller gas tank or just do not fill it up as high as you are. Every little bit helps.
I think the Arrow Warrior is built stronger, so thus why it is probably heavier.
Well I would hate sell the arrows kart because it is brand new, but regardless I have 3 karts and I need to sell two.