The whole purpose for riding is having fun. And if your 3D suits you and puts a smile on your face than forget about what anyone else says about it. One of the very first things I realized about this sport is to set up your ski to your own liking. Living here in Oceanside CA I either currently ride with, or have had the opportunity to ride with the very best riders in the world. I have also pretty much ridden every one of their skis and this is what I learned.
1. What works for them doesn't necessarily work for me, as I pretty much disliked almost everyone else's ski/set up that I've tried, and I'm not just talking Aftermarket hulls, I ride a Superjet and I don't care for the way others have set up their Superjets.
2. They feel the same way about my ski, to them my ski is a pig Haha!
3. Personal set up preference is everything, it means the difference between feeling comfortable on the ski to the point you can really throw it around and ride it to its full potential verses riding around in an unstable circle waiting for the second you get back on your own ski.
4. Be realistic with your riding goals. I'm 50 years old, and even though I think I'm 20 when I ride, I'm really way past my prime. Yes I can Barrel roll and Back flip because I live near the ocean and have been riding forever but I am nowhere near the skill level of the top pros. I realized a while ago that buying an expensive Aftermarket hull is not going to change that, and my Superjet can handle anything my 50 yr old body can throw at it. I guess what I'm saying is there is no need to upgrade the ski you ride until you know it is holding you back.
That being said if you still want to get a stand up, taking into account your size, I personally think an SXR would be the ticket. It would feel small to you so you can throw it around easily and you can easily change the handling characteristics buy simply switching out your ride plate to different lengths, a "D" cut for surf and "Long" for flat water carving. You can also do an 1100 conversion for less than $2000 and you'd have all the reliable HP you can handle.