I feel your pain! I am just about the same size as you and ran into some of the same issues. My problem is most of my height (and girth) is in my torso so I have to really watch out for that gap between the chest and ab. The chest can definitely come down some since the back of the shoulder straps are floating. Luckily I did not have to split the cod piece but I do not have much room to play. I am not sure about the MTK kit because I was able to use the AM. I know RT-Mod makes bigger stuff but the guy who helped me said he has never seen a bigger set of TK. I think I am walking that fine line between "wow, that is a big intimidating Stormtrooper" and "whoa, the Empire is really letting their physical standards slide" :-) Anyway, best of luck and know that it can be done for us bigger guys.