There are a lot of variables and no one "optimal" input level. Are you clipping when recording? Back the L & R channels down a little. Don't let the meters reach the 100 (0) mark. Don't worry about the level being slightly lower. You will be able to adjust/increase the volume levels with the software when doing your mix on your computer.
Also, what are you recording...your drums? If so, how close is the recorder from your kit or the source of sound that you're recording? It may be just a matter of moving the recorder away from the sound source. Start with lowering the input levels and make sure the recorder is not too close to the sound source.
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