I hesitate to insert myself here, but it's Monday morning and I'm on the internet. You'd need to add more color. Some things to add to this:
1. How long was the offseason before Base?
2. What is Base anymore? If you're not riding 15-20 hours a week is it really considered a "Base" period? It may be semantics but your traditional Build follows your traditional Base. If your Base is really Build-Lite, yeah you may run into problems
3. How many weeks was your Base?
4. How many times a week were you doing SST?
5. What numbers of hours per week were you doing SST?
6. How many total hours were you riding in that Base phase, versus the time in SST?
7. If a train leaves NY going 84 mph...