I have a Direto also. When I bought it, I understood in concept about the wattage floor for trainers, and discovered when in the big ring, mid-to-small cassette cog, I was not able to hit target power during lower power sections e.g. rest intervals.
The attached table shows the working range (wattage ceiling and floor) for cadence/gearing combinations for the Direto. If you ride big ring, mid cassette for your work intervals, be aware you may need to shift into the small ring for rest intervals.
