Having a seperate bank account for your rentals and having the discipline to have all your expenses and payments go through that will also make tax time a lot easier!

And keep the discipline of tracking as you build your wealth.

Lastly, if your goals do align to running with 15yr mortgage, remember you can keep your 30 yr mortgages but just pay them down as if they were a 15yr (assuming you have the discipline). 

It took a lot of self discipline and studying, but it can be done!

If you can have that kind of discipline for two years you will be out of financial jail.

But it depends on you and your financial discipline.

There are not many people who are disciplined enough to save at the rate you have thus far.In this business both short and long term you either need money or access to it to grow and sustain, there is no way around that. 

A smart guy once said "All models are wrong, but some are useful" It takes a lot of experience and discipline to know if your model is useful or if you are simply fooling yourself. 

@John Warren thanks so much, that's where I've landed at about 90% confidence, the only "issue" really is my impatience, so I need to be more disciplined.

With the market where it is, it's important to stay disciplined and as long as you buy right you should be ok.