I have a Pinarello Nytro (Fazua motor) and I am experiencing exactly the "phasing" issue that you have described. I contacted more than one dealer and they promised to get an answer from Fazua but so far no solutions have been provided. I have been told that the issue is a software one as it is enough to change the sensitivity of the pedal pressure sensor. I tried to enter the Fazua software system (Evation service Toolbox) but I could not find any available options. I hate this issue and I am therefore not using the bike.