As printed, GWF adds +1.33 damage on 2d6, +0.83 damage on 1d12, and +0.8 damage on 1d10.
With your change, GWF adds +1 damage on 2d6, +0.75 damage on 1d12, and +0.7 damage on 1d10.
If you change it to "turn any below-average roll into the average roll", it adds +1 damage on 2d6, +1.25 damage on 1d12, and +1 damage on 1d10. This is my recommendation.
If you change it to "you can reroll any damage die", it adds +1.5 damage on 2d6, +1.5 damage on 1d12, and +1.25 damage on 1d10.
If you change it to "roll 1 extra weapon die, drop lowest", it adds +1.46 damage on 2d6, +1.99 damage on 1d12 (its expected value is 0.03 better than 2d6), and +1.65 damage on 1d10. (Rolling 2 extra d6's adds +2.34 damage on 2d6)
With your change, GWF adds +1 damage on 2d6, +0.75 damage on 1d12, and +0.7 damage on 1d10.
If you change it to "turn any below-average roll into the average roll", it adds +1 damage on 2d6, +1.25 damage on 1d12, and +1 damage on 1d10. This is my recommendation.
If you change it to "you can reroll any damage die", it adds +1.5 damage on 2d6, +1.5 damage on 1d12, and +1.25 damage on 1d10.
If you change it to "roll 1 extra weapon die, drop lowest", it adds +1.46 damage on 2d6, +1.99 damage on 1d12 (its expected value is 0.03 better than 2d6), and +1.65 damage on 1d10. (Rolling 2 extra d6's adds +2.34 damage on 2d6)
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