Great post. It's not often you see founders share how they arrived at their equity split.

I highly recommend The Founder's Dilemmas by Noam Wasserman (http://www.amazon.com/The-Founders-Dilemmas-Anticipating-Ent...). The book is very data driven. Noam uses the data he collected over the last 10 years to backup the different scenarios he discusses. Chapter 6 talks about equity split and Noam talks about the difference between 50/50 hand-shake splits, 50/50 designed splits, 51/49 splits, and other splitting scenarios. I got the audiobook and it's an easy listen/read over the weekend. For me, this is not just a "one man's opinion" book. Its data driven nature makes it a must read.

Other parts of the book talks about different co-founder options (family, friends, co-workers, life partners), role divisions and funding choices.

I think you applied a very rational process to founder equity here. thank you.