That's how I designed mine too. Seemed like the best price/performer.
Yeah, in my case I couldn’t really go any bigger without starting to put panels on my north facing roof and I’m not sure that’s a great idea in terms of cost/performance.
Additionally it’s already a pretty big system and I don’t know that I’m necessarily going to be in this house forever. I feel like it might make it a little harder to sell this house at some point (or at least try to recover some of my investment) if the system would produce twice as much power as a normal household would use.
So far, on paper at least, I’m pretty happy with the size.