This would allow me to raise the rent for the main house a bit over market but I'm concerned usage could get out of control and making my cashflow take an unpredictable hit.Does anyone see other options here that may work better than the two above?

Don't know if they raised it or not.   

I purchased a property before that had way below market rents that were locked in for a year and after a year I raised those without doing any work and was able to get them to market rent.

I feel a bit stuck in this scenario, and I could use some advice.I'm raising some money from private investors and wanted to run some options by more experienced posters, because I'm a bit unclear as to what the best way is to structure my deals with private investors, or if there are better options that I'm not considering.Here are some rough numbers to capture a deal that is on my radar:Loan amount from investor: $110kYearly Interest Paid to Investor: 7%Monthly Rent from Property: $1300Monthly Interest-Only Payment to Investor: $642Monthly Property Taxes: $71Monthly Insurance Payment: $71Property Management fees: $104Net Cashflow: $412Now, this is not a bad outcome, and I am fine with it, but I am wondering what someone else might do differently if you were in my position - Should I charge an upfront fee to my investor (maybe $5k or so for this deal and also keep the cashflow as my monthly management fee), or would you instead use the $110k from the investor to BRRRR a bunch of deals, or would you try to just use the capital for one deal at a time?

I've done post cards etc. 

I have been in communication with @Scott Trench about the topics you have raised, and I believe we are operating in line with what management is currently allowing on the forums.Booooooooooooooooooooo.

If not, any obvious alternate investment that I could do on the property to raise it's value, get more rent, or save money that I may be missing?

If you want to do postcards, DealMachine has a way that you can send post cards directly from the app/site.

WEBSITES that offer pick dresses have pink dress content on it and Google crawlers catalog all websites on Google so Google can retrieve them when someone looks for them.If you build a website where you tell everyone (Google included) that you buy Duplexes, anyone who has a duplex to sell will find your website, if you are decent at SEO and that is how you find Dumplexes with a website.You can have your website target anything you want.Lastly, I always find it funny when people pull that $7K card on me.

The key factors that may raise audit risk are discrepancies in reported income, excessive deductions that appear out of line with your income level, or unusually complex transactions.