On the surface, the basic components of your application are fine.
Academics: Your GMAT is, like the other post mentioned, [almost too] good. Your GPA, while on the slightly lower side, is from a great school with a diverse background and your master's program easily addresses any doubt they may have about your ability to handle rigorous academics.
Extracurriculars: While your on campus activities in undergrad are on the average side (per your assessment), they aren't as important as your activities since and are either a benefactor or victim of the story you weave around it. Were there any activities in undergrad that really stood out to you or that you've continued in at least a tangential fashion since?
Professionally: Ok, here we'll need a little more information. What did you exactly do for the trading firm, Google, start ups, etc.? Your professional story is differentiated not by the titles and brands on your resume, but by the activities that convey key themes in your application. However, I think a lot of these themes can be covered by your entrepreneurial forays and whatever your full time jobs leave off the table, your start up can fill in.
Overall, yes, HBS is a particularly difficult program to assess odds at but I believe you have a better than average chance.
If you'd like to share more information about your experiences, that would really help us to dive into certain components. If you have any questions or comments, please don't hesitate to reach out!
Managing Partner, Founder
Critical Square | MBA Admissions Services
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