Yeah, dash enforces a minimum speed now. I've been trying to differentiate movement types so there's some situations you'd use one mode over another and vice versa, as well as making builds have more variety in their strengths.
If you want to change dash direction quickly, you'll have to use the Assault Pack and use the dash input again while dashing (chain dashing). Otherwise, jump or burst to change directions, then dash again to continue moving at speed.