Go to BB.com and look at the practice video after Peterman was announced as starter. Tyrod and him are doing drills. They were throwing outs to WR's. The ball basically got there at the same time. So if you were happy with Tyrod's Arm Strength you should be happy with Peterman's.
Besides he looks bigger than he did earlier this year. I am sure he throws it much faster now.
Nothing to worry about.