First, I would post this in the tailor's thread where trained people have an eye for this stuff. Second, while I would advise against massive chopping of any suit, perhaps you might be stuck with this same problem no matter what you wear. if you are that thick across the upper body and thin through the waist and torso, you are going to find suits hard to fit in general. While SS suits have a decent drop, when they say slim they mean cut slim all the way down. Looks like you may need something like a 9" drop, which you aren't going to find anywhere. So I guess my main, non-professional opinion, is to take it to a tailor and have them pin it and see if you like the result. Good luck!