Country Resources in my opinion are too high for Enterprises. If you for example buy a state corporation that makes 1B profit/month, as private corporation you'll usually be lucky to make 200M. I know the 225 vs 200 helps, but its not enough. I realize a large Enterprise with thousands of corporations, 200M * 1000 is a lot, but for newer players like myself (I think I have 40 something corporations?), its not much. And the vast majority of corporations don't/can't make 1B profit/month as state corporations anyway. Well, actually pretty much any in theory could, but with the current market most can't.
I'd also consider raising the selling price cap from its current approximate 10% above quality (IE if Oil is $1,350, and my quality is 200, I can sell it for about maximum $1,350 * 2 * 1.1). I haven't ran the exact numbers but I know its definitely close to 10%. Setting sell price higher than about 10% above quality is useless (unless this affects immediate buy price??).
I've posted elsewhere about the Natural Resources problem, which I'll say allowing small CEOs (like my 2) to build them would help some, but it won't fix the problem of the corporations which mainly depend on Natural Resources (such as Gasoline).