450 is an amazing size implant. I think on any frame they will look full and big! I had 350 four weeks ago and they’re very big but wish I could have got a bigger implant 🙁 and I’m sure it’s at a 90% angle so yes bolt upright is important but over the upcoming weeks you can lower yourself til you get to around 45 degrees by 6 weeks. As long as your chest is elevated higher than your stomach it will be fine. But for the first 2 week I wud one hundred percent b bolt upright xxxxxx