I think if you need high baseline of stability while you work on your own stuff, spend some time finding a good long-term consulting gig and then be disciplined about it. If you can get away with working 2/4 weeks, then the other 2 are for your startup. Some clients may want you to report daily, in this case, I would suggest that you work half as long as a normal work day to fulfill their reporting desires. Its a bit more annoying but once you build trust, I'm sure they wouldn't have a problem.