[farseer]

>>nearly-profitable pre-Series-A SaaS startup

If the startup is loosing money, no matter how small. You would be under a titanic amounts of stress. Though I can't really judge the future potential of the startup based on the information you have provided. I'd say stay put. Use the spare energy and sanity to work on your own side projects.

[jcahill84]

This is a really good point. I agree it's a better use of energy to work on side projects while your work-life is stable, rather than injecting stress into your life.