Looking at your stats, I wouldn't say you were a cheater.
I found a guy the other day whose acct started mid March, like yours, but his first 3-4 rounds as a Hack were in the low-60's. As soon as they made it to Tour Pro, which didn't take long, they got in to RG's but only for easier courses, e.g. St. A, RSG. Their stats showed only 36 ranked rounds and they were already a Tour Master. All within 3-4 weeks. That's a cheater.
Your scores look like honest efforts. Looks can be deceiving, of course, but I believe them to be honest.