If we don't incorporate, whose name should the property be in ( if we buy it individually and take advantage of the first time home buyer incentive in ontario we can put 5 percent down instead of 20 and keep cash reserves encase something happens to the property.) ?

I got lucky as this home was a bit too small for families which worked to my advantage.

What are some advantages and disadvantages of using a HML?

Plus right now interest rates are really low, so why not take out a slightly larger loan (assuming you can afford the payments) and take advantage of the low interest.

But then I'm not taking advantage of leverage. 

@Andrew Carlson I think you are combining two separate things: 1. tax advantaged retirement accounts and 2. investing in publicly traded securities (stocks, bonds, mutual funds, ETFs, etc). 

Its an advantage if you'll look for their mobile phones too so you can as well text them. 3) When’s the best time to call?

No need to take advantage of the seller/note holder. 

Was financed as an investment property so interest is fairly high at 5.75% given the current low rates looking to see if there are other options (if any) to take advantage of these lower rates.

Appears to be better than ira type options for self employed tax advantaged saving account