That is amazing you've been putting that kind of mileage on that bike!

When I bought my road bike, they said when I'm in riding position with my hands in the hoods if I look down toward the handlebars they should line up with the hub of the front wheel. If you see the hub in front of the handle bars you are too far forward, if you see it behind the bars, you're too far back. Just a guideline, hope this helps.