Welcome to the forum.
These Xtreme bullets...are they cast bear lead, black coated cast, jacketed or plated?
You want the bullets ogive out, close to the rifling lands to stabilize the bullets quickly.
Load as long as your mags can function 100%.
1.155- 1.157 is optimal with my Glock G17. Short loading TiteGroup is bad juju.
Flare should be absolutely minimal, "just" enough to accept the bullet base.
The Dillon Taper die is key to my setup. No crimp per say. The Taper die simply forms the case mouth uniformly around the bullet and keeps it there firmly.
Shoot fast, handload your ammo SLOW.