Were you riding over 200 miles per week?

If not, I seriously doubt you were overtrained as a regular roadie that road day in and day out. Furthermore, it's pretty near dang impossible to ride 'all-out, all the time' if you're doing that much mileage. YOu might think you are, but you're not. The body can only sustain "Lactate threshold" and harder efforts for short periods of time, like 1-1.5 hrs tops in a single workout, and that would be a true all-out effort that would leave you keeled over on the side of the road after you're done, not just feeling tired.