Blend from Idle to Walking

Hi, I have a Blendtree that blends from Idle=0 > Walking=0.5 > Running=1

At 0.5 the speed for walking looks good. But at 0,25 you want half the speed, buts it alot slower, How can i balance the Blend between Idle and walking so it more agressily uses the walking anim over the Idle? (Thats my guess why its so slow at 0.25). Here is my Blend tree