I tried to work with my tenant but they cut off all communication with me and wont respond to anyone.

I think you can go as high as 15% but it's cutting into your margins and depends if you are a GC yourself or not. 150k is close to a million or more.

Good job on this flip!  

Use a buyer's agent that knows the market, contracts, negotiations, etc.If you really want to learn about investing, get a job in property management. 

I have a W-2 job primary and my business partner has another business.

They are up and running again, but this pushed jobs back. 

If you cut expenses down by $5,000/month, you can retire your wife.

From my experience, cities like Greenville, Columbia, Augusta, Huntsville, Chattanooga, and Jacksonville offer strong house-hacking opportunities with growing job markets, solid rental demand, and affordable multi-family options.

However while people in Windsor doesn't have the luxury of high paying jobs that GTA residents have, is it just a temporary fever of buying houses, or there is really something going on in this city ? 

I’ve been in contact with the Better Business Bureau about them  cut your losses and go the other way.