Fine barrel but a slow one - followup - True Precision Pistol Sig P365 XL Barrel, Threaded

Followup to my earlier review. My barrel mikes at .35535" (slugged) on my Mitutoyo micrometer. Suspecting possible roughness I lapped it extensively, which bumped most velocities a little. After lapping WIN Ranger 127-gr +P+ went from 1195 fps to 1233 (extreme spread=17.) Speer 147 Gold Dot went from 940 to 964 (ES=20.) WIN Ranger 147 JHP was completely unchanged at 932 fps. WIN brown box Service Grade 115 FMJ went from 1107 to 1149. A light handload of 124 JHP with W231 powder went down from 1036 to 1026, both of which are slower than in the original Sig barrel. So most velocities are a bit faster than in the Sig 3.75" barrel, after lapping. But a 2% after-lapping velocity increase over the original 3.75" Sig barrel with my 127-gr Ranger (1204 to 1233) won't convince me to carry the P365XL with this longer barrel.