If you're feeling alright I'd recommend going that extra week for sure bro. Did you front load? I'd definitely be sure to taper that off. And definetly stay on the sust a good bit longer than 5 weeks, I'm sure you already know that. If you started them at the same time 4 weeks ago then I would assume that almost all of your gains are from the pinkies right now and I'd guess that some of that is water retention which will go away really quickly when you get off. Go the extra week and get a few more pounds to keep.