Wouldn't the term "Statistical Arbitrage" be a more apt description of what you were doing?
If you are relying on a broker-supplied pricefeed over the internet you are far outside the real of what is traditionally understood as "High Frequency Trading".
It wasn't anything over the internet. I had a server rented at my broker who were situated close to the exchanges in Chicago and had direct lines. For sure I was not the fastest but only behind by a couple milliseconds perhaps.
If you are relying on a broker-supplied pricefeed over the internet you are far outside the real of what is traditionally understood as "High Frequency Trading".