I can't just put the LLC's income directly into my joint personal tax return, right?

Getting into real live action (not meta) will connect you to your next real partners, and new stream of income strategies.

The goal here would be to increase rental income.

I would rather invest in safe markets that produce a good return, then I can use that income to pay for a vacation anywhere in the world.I'm very pessimistic about the STR market in Hawaii.

They are exceedingly rare, thus very expensive, but I believe they represent an excellent long term steady income and store of value.  

@Christopher HeidrichRecommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

It lets you focus on managing the property and getting steady income right away.

We’re looking to increase our lifestyle through the decrease in housing and built a little passive income medium term. 

More on DSCR loans: DSCR loans won't use your income to underwrite the loan. 

The idea behind this analysis is that I would follow these strategies for a long time, and scale.. but as far as I can tell, I used realistic numbers as far as the income goes... unless if I'm wrong and that could change everything.