I was involved in a much similar situation... a start-up with 2 business guys and 3 tech guys. The tech team was 3 not-yet-graduated students, and we were always suspicious of the business guys.
However things turn out, just be sure that your "%" is the same kind of "%" as theirs is -- if your shares get diluted, so do theirs. This way, all interests are aligned: you all have slices of the same pie, and work to make that pie larger.
From what you've posted, it seems completely unfair for the 4% to come from you alone. It should be diluted from the remaining 80% not owned by Austin, and it should be agreed upon by all that own that 80%. In other words, it shouldn't be Austin asking you for 4%, it should be Austin asking everyone involved for 4%.
I advise you to consider dissolving your partnership as soon as you can.
I had once experienced a similar situation: The business guy, who had experience in SAP area (he was an expereinced SAP-Consultant) had come up with the idea of founding a new freelance job search site, me being the developer.
Having developed a nice prototype using the latest technologies and after we were ready to form the new company there surfaced an issue: He, the business guy said that he receive the %60 and me the %40. The reason was that he has the initial idea and he thought of the business model
and the related intricacies and that he has employed all his vast (and past) experience on the target customers... and he wasn't far from truth at this respect...
However still, his wanting a marginal majority just didn't feel right, considering that both of us afforded the expenses without getting any income.
So my advice to you: When it just doesn't feel "right" then think seriously to drift apart. The numbers are just the indicators of the main purpose behind: They, the business guys want and will always want more than you as long as you are doing business "together"
And oh by the way, it doeesn't have to be running a startup , you could be doing business in other relationships, i.e. they or he might rent their office or home to you and in that case... you guessed it right: They would try to charge you as much as possible, so beware..
However things turn out, just be sure that your "%" is the same kind of "%" as theirs is -- if your shares get diluted, so do theirs. This way, all interests are aligned: you all have slices of the same pie, and work to make that pie larger.
From what you've posted, it seems completely unfair for the 4% to come from you alone. It should be diluted from the remaining 80% not owned by Austin, and it should be agreed upon by all that own that 80%. In other words, it shouldn't be Austin asking you for 4%, it should be Austin asking everyone involved for 4%.
Best of luck.