Do change the oil, it's worth it. Also, pay attention to the oil height/air gap - it's very important - so you will need to take the forks out to do it properly. If anything, underfill both legs by perhaps 20cc each and see how it goes on the road. Adding oil (thereby reducing the air gap, which acts as a spring) increases the stiffness of the suspension when hitting bumps - and it's much easier to add oil than to take it out again. The springs effectively just determine the ride height, which must be sorted out before any other fork tuning.
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