I see the same dramatic increase in cash flow that you do and would love to acquire a few more STR's along with a new Ferrari but I need more data to feel secure.

The forums at MyFico are really robust.  

Leveraging Shannon's local market expertise, we secured the property for $215,000.

Leveraging Graham's local market expertise, we secured the property for $370,000.

Security cameras that alert you to motion, along with motion-activated floodlights.

Sales rep who finds the buyer and get's the down payment to secure the sale gets 20% of the fee.I tried this model when hiring reps and realized it didn't work since I was paying for all the overhead, supplying leads (like you) and the reps were not staying on top of the lead calls.

I would like to know which banking institutions and type of accounts you are using for security deposits that comply with Florida law.I have heard to use an escrow account.  

The same amount invested in the securities market stays fully deployed for the entire term - in other words, all $12k of the principal (the basis) is at work for the entire 5 years.

@William Hochstedler  were I saw this model fail miserably for LA based investors was even though they are full doc.. the cash reserves that are there at the beginning.. investors get this irrational sense of security that their rents are going to come in like clock work that the homes are going to stay rented that their home will be taken care of like they would.. and the reserves end up getting spent on other things in their lives.. thereby wildling down their reserves.YOu have a bad run... you need 5k to fix up and re rent... house is vacant for 3 month during the process... and if you don't have the funds your PM is noting going to front it for you.. and down the tube you go. that's what I witnessed.. these were not speculators  these were people that thought their 100 to 200 a month positive were a given and could never change.. and they were woefully under capitalized. 

I think it really comes down to what you are comfortable with but I don't think background check, credit card check, etc on top of a signed lease (and even small security deposit) is unreasonable for an MTR.