Honestly, the set screw sticking out some doesn't really affect performance. My Savior is my regular saber and I've not had an issue. Part that sticks out sits between the ridges in the emitter so it's not noticeable unless you're looking close, and it doesn't loosen any faster than another saber with heavy use. I will say though that I usually take the little knob below the emitter off because THAT can come loose and affects grip it the best spot on the saber. If you REALLY want to, it's possible to tighten it flush, but it will leave a huge indent on your blade.
Zren, the Savior is also my go-to, two-handed saber for dueling. I have put it through a lot of combat this year with no problems. I agree with everything the Lady said. My suggestion would be to remove the decorative knob and to change your hand placement while wielding the saber. Since you have a shock pommel I would recommend that change too. The natural choke point below the colored emitter is ideal, so your hands would never even come in contact with the retention screw. Also, I would recommend lacrosse or fencing gloves for and sparring and that should prevent any screw related scraps. I had a picture of my Savior with one of my cats on my phone (who doesn’t?), so I just marked it at the natural choke points you should try to have your hands. Good luck!