You are already claiming the interest portion from the mortgage payment, so not sure if using the LOC to reduce your mortgage is a good idea.  

Any environmental issues must be contended with, zoning or land use violations will come to light when a property goes under contract and may kill any sales or drastically reduce the property’s market value.

This crew has been ahead of schedule and proactive from day one.

For example my 2 bedroom with 2 TVs jumped to $170, I had to call in and get them to reduce it to $80.

Check with your lease and State laws but I attempt to take a proactive approach to avoid insufficient notice:Proactive - at least 60 days before the lease is set to expire I sent out a "renewal rate offer letter." 

Things such as;keeping hand sanitizer stocked in multiple locations in the unitSanitizing common touch points such as door knobs, light switches, shower knobs, etc.Keeping hand soap stocked at sink locations....And there are many more hereI think if you're proactive in things like these, when other owners may not be, it will make you're listing look all that much better.All the best!!

While there are some big positives (low maintenance), I don’t think they’re generally outweighed by the negatives of increasing HOA payments, reduced appreciation, and my biggest concern-changing HOA rules on rentals (what happens if the board changes the rental cap or eliminates rentals all together?). 

Since the governing MLS in the area (some are owned by the local Realtor associations and some by private parties) don't have the listings, many of the local agents don't see the listings and thus competition is reduced (so the argument goes). 

Petesburg, FL area that is good with proactive real estate accounting?

You’ll get the additional tax benefit of the interest on the mortgage being tax deductible, reducing your tax liability.