In training mode changing the CPU Percent doesn't do anything. Instead, changing the Player Percent changes the % for both the player and CPU.
#Practice mode CPU percent
grizzled geyser
halcyon crag
iirc changing the cpu's percent works only after it dies
(still an issue though)
teal mulch
Also reported previously here: https://discord.com/channels/63722835520004096/1352012547703705730
In the meantime player damage % sets % for both player and cpus