Thanks! These are helpful points.
Unfortunately no power meter, so can’t use that as a frame of reference. So only using virtual power.
Trainer is the tacx blue matic. Its quite old about 7 years.
I replace the outdoor wheel for my dedicated indoor wheel. And generally keep on top of the pressure. Could this be the cause of a 30 watt plus difference? conversely after pumping them up give me a gain, but this rarely happens.
Roller pressure is constant I generally double check this.
Was just wondering if its anything major. I’m more inclined to think my issue is trainer based given the number of variables rather than fatigue.