IMO that is no problem, you just have to be more focused on the task at hand. A common advice is to use smothing, for instance a 3s moving average. I never do that because it delays the feedback given and only makes it difficult to adjust the power output. Try to raise your cadence slightly as power increases. I tend to start att ca 75 rpm and end at about 110 rpm. It takes some practice to keep a stady power output without ERG-mode but in reality it won’t influence the end result significantly as long as the last minute is a maximal effort.
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