Hey man I have one in Kissimmee. Looking at your expenses there are a few things that are different from mine. I have a 6 bedroom in Storey Cove.
$245/Month - Insurance (based on Zillow listing in Regal Oaks) - This one seems very high. I pay about $133 a month.
$145/Month - Cable/Internet (based moneysavingpro.com) - This is included in most HOA in the area
$117/Month - Repairs ($1/sq. ft. for Zillow listing in Regal Oaks) - Seems right in a condo a newer small home
$180/Month - Capital Expenditures (best guess) - This is high if you have a condo as you wont have much capital expenses.
$475/Month - HOA (based on Zillow listing in Regal Oaks) - About what I pay
To add - Supplies
In the end it looks like your about $300 or so too high. As example my one I bought for $650k has expenses between 4,500 and 5,000 a month. Now I do have a better rate then what's out now but I am still looking for other STR. The margins are a little tighter but there should be no way your coming up negative. Feel free to reach out if you want to talk more