Shoot the can a few more times before you group it. Seems you had first round pop which def reduces accuracy. Run it dirty and this goes away more and more you shoot.
After the match today we shot mine and aj's silencer side by side, I was shooting a 10.5" SBR with a Saker 7.62 with 5.56 end cap, aj had a 16" with his can, his was louder with the first round pop, then you couldn't tell who's was quieter , they did have a different tone, I'm impressed!