If things go well, I'd like to own 4 units by the end of 2018, and continue to scale from there.With the above in mind, I'm analyzing as many deals as I can and would greatly appreciate feedback regarding the below property (whether you feel anything is missing, your thoughts on the returns/cash flow, etc).

I would continue buying in the market of your first rental

I believe this is largely because they don't have to cover a gazillion dollars of personal property that they are making me insure.Rates can also vary based on your credit and claims history. 

Welcome and I look forward to your continued success! 

Or maybe continue flipping houses until you're 7 years out of discharge.

Yes it might still be a good investment if the market continues to rise but it's harder to guarantee that.If I were you I would start looking east down the major highways to where the workers live.Go into a restaurant and ask your waiter/waitress where they live and that's where you want to invest for cashflow.

The contractor currently is refusing to continue work and wants to be paid ~$13000 for extra foundation work based on a subsurface condition clause.

Not sure why my reply was different on my phone so I'll continue using my PC.

This is continuing to grow I know Tripz is doing this.

Very passionate about watching Tucson continue to grow and thrive.