My HELOC will help supplement financing costs, and rehabs in the event the HM isn't favorable.

That's perfectly fine and fair-- just keep the assets to supplement your life style in the most risk-averse and conductive to living a free life. 

This is better than I expect the mutual funds in my 401k portfolio to perform(10-12%) Plus I would like to eventually use some of the cash flow to supplement my income before retirement age. 

We BRRRR 8-10 peryear and the flips supplement and money left in the BRRRRs.How do we choosewhich ones to BRRRR?

The cashflow would then be supplemental retirement income for them.

For individuals tethered to a W-2 job, this presents an opportunity to judiciously manage their tax liabilities while exploring supplemental income avenues.If this sounds like something that fits your investing goals, please reach out.

To date, I've entered 50 MF deals, 14 of those have sold and 4 have gotten supplemental loans, returning more than my initial investment - a friend pointed out, I'm playing on the house! 

We've spent the last ~2 years taking stock of our experience, supplementing our knowledge through bootcamps, research, and mentorship (thanks DeRosa Group Accelerator!)

For individuals tethered to a W-2 job, this presents an opportunity to judiciously manage their tax liabilities while exploring supplemental income avenues.If this sounds like something that fits your investing goals, please reach out.

In the time I do have, I'm interested in supplementing my primary job income by creating a rental real estate company (becoming a landlord for a few properties).