You definitely have the torso length and even arm length to pull off 178-181. I say as long as youre willing to sacrifice a little athletic ability, go for it. You'll probably look more proportional after LL than before!
Only thing is that you will have very narrow shoulders for your new height. Since you have a sort of lowish wingspan and long arms, that is to be expected. Think about maybe bulking up or doing clavicle lengthening as a possibility.