Here's how I would have done it:

http://images1.bingocardcreator.com/blog-images/hn/deep-disc...

Anyhow, the idea was to simplify the workflow and simultaneously abuse the power of defaults and user psychology. I also intentionally ditched some parts of the offer which I don't think add business value, such as fine-grained control on the split.

(I'd A/B test including "65% of people pay this much" on the #1 step, probably with a subtle yellow highlighting.)