So in short, the past six months have been quite an adventure, left my day job, started a business, and moving to AR to start my own path as an architect-developer.

My husband and I own a couple of rental properties in other states but would like to buy one here in the Phoenix area.

Most are going to screen for: lowest priced, top listed on Google (many top listed PMs in your local area pay to be sponsored, so their actual listing is much lower), volume or size of business, and those who are willing to break their own processes to simply tell you what you want to hear (e.g., I'll list your property $300 above the AVG even though the CMA shows that's overpriced and I won't tell you that it's going to sit vacant).

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

You may need to be a licensed real estate broker/agent to wholesale legally in many jurisdictions7.

But tiny things like visiting your own listing daily and making changes to it, tells the algorithm, "This host is an active host." 

I am trying to figure out if I should also max out my own personal Roth IRA in the S&P or just use all my money towards RE.

Every person's choice is own or rent.

If the new property isn't owned by the llc then you will not want to put the income in the bank account nor pay expenses from it. 

Most never own more than 1.