Under stable 6-8 speeds

Currently, I throw a Streamline Neutron Drift as a my main driver. I can throw it roughly 300-325. It works great for hyzer flips and holds hyzer lines nicely, but I can’t get it to hold any anny. Whether that’s a disc “problem” or a form problem, I’m unsure. Anyways, I’m looking for an under stable 6-8 speed that when thrown on slight hyzer to flat will push right.