two of the runs are the same under ancient spear, the harpoon and rage flip are the same
They are not the same. Read it again. Similar but not the same. Rage flip is what you want to use in all situations.
Trying to push with Rage Flip is so much better than Harpoon.
Trust me, I spent all the way up to GR 122 this season as Harpoon accidentally. Rage Flip feels so much better.