How much distance is actually being increased for Sakura Abyss?
I updated the wiki quite a while back to specify the effects of that reforge. In case you need additional clarification:
Reforge Bonus:
+1 Distance per charge per level
Radius Calculation:
300 + (# of Charges × 20 + Reforge Level)
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Rank 1 Sakura Abyss has a radius of 320 to 600.
A level 20 reforge extends this to 340 to 900; an increase of 50%.
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If we get the KR Ninja changes, the damage will jump up to 500% and the radius formula will change as follows:
KR Radius Formula:
300 + (# of Charges × 40 + Reforge Level)
Rank 1 Sakura Abyss has a radius of 340 to 900.
A level 20 reforge extends this to 360 to 1,200; an increase of 33%.