I have always preferred rowing from a centered position, whether loaded with gear or on a day run. I have friends who like the forward rowing position for some of the reasons mentioned above. I have tried it, but didn't like it. To me it felt like the tail wagging the dog so to speak. I feel like I can pivot, push, pull, ferry, etc. better from the center. This is just my personal preference after trying both.
In looking at the photos on the Madcatr website for reference, it looks like most of the class IV - V cat boaters pictured are either centered or slightly forward of center. However, I have seen many Cat boaters on the Payette more forward. I'd say try a few different rowing positions to see what you like. If you're rowing a playcat without gear, you have more leeway to move your frame around to try different things.