what do you not like about your barrel, the accuracy or reliability? suppression is based on several things; a few are, ammo (velocity and pressure), barrel length, and suppressor itself.
i have a 5" TROS barrel that i love. it's very accurate for me with factory American Eagle 147gr bullets. those AE bullets are subsonic and sound great through my TiRant45. they will likely sound better through my Evo9 but not by too much.
The only reason i'm going to a 16" barrel is b/c i have a DDLES lower that i will SBR, but i want to put a stock on it now, so will build a full rifle and return it to an SBR once the stamp comes back.