When doing BRRRRs you may have to leave some money in your deal but you’ll still be able to scale a lot faster than the typical buy & hold strategy.

Quote from @Robert Ruschak: Would you skip the 700+ single family houses and scale up faster into multi-family?

Regarding all of that work, is there anything you think could be automated that would either free up your time to close on deals faster or help you profit more on a deal?

In past history (IMO), the ones that contribute less and stay home all the time seem to break more things faster and consume more things.....and sec8 requires you to repair or fix it.I do not take a loss for sec8 vs market. 

So, what is happening today is not as important as what will happen in the foreseeable future.If rents are increasing faster than inflation (I use 5% per year as an average rate), then it may be worth holding the property, since your cash flow will increase as rents rise.However, in your post you stated, "Mortgage rates have kept increasing as well, that's why I put a range on negative cash flow."

My wife and I earn over $350k a year in our jobs and all of that is now going to pay down debt.We have the option to increase our HELOC to unlock some more capital which I'm considering doing to try and get a good return on my money and pay down the debt faster, but given past experiences I'm not convinced it won't end up with more debt.What would you do at this point?

In fact, getting ahead of it now while your business is small might enable you to grow faster so you're not scrambling to build these in the middle of the growth. 

It takes time and patience, but the long-term benefits are well worth it.I’ve personally gained invaluable knowledge, listings, and deals from friendships I’ve built over the years.The more people you engage with, the faster you’ll achieve your goals!

If the answer is yes, then it's a no brainer to make minimum payments on your 2.8% interest rate mortgage, and use the funds that you would have paid extra to pay it down faster, to either invest in more real estate, the market, or anywhere else where you can get a ROI > 2.8%.If the answer is no, then feel free to aggressively pay it down as fast as possible, to become debt-free faster, and just have a large amount of money in savings or to splurge with.The bottom line is that your 2.8% mortgage is GOOD debt.

You need an income that meets three requirements:Rents increase faster than inflation to offset constantly rising prices.It must be reliable; it continues even during economic downturns.It must last throughout your lifetime.These are all long-term requirements, so the current interest rates are not the major issue.