.1gr is barely within the resolution of your scale. You can't really be sure you're even increasing on every load.
Newberry's recommendation of 0.7-1% is perfectly safe. I increase 0.3gr with max loads of 28.0gr.
If max is 48.0, 0.7% would be .336, so use .3 or .4. Either would be fine. No danger.
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