Those variations are pretty much what I would expect from light loadings, especially if you didn't do any out-of-the-ordinary prep work (sorting bullets, verifying each individual charge, sorting brass, etc).

They will also not make any great difference in accuracy, certainly at 25 yards, perhaps even at 50. A long time ago, when chronos first came out, Bullseye shooters realized that the light, super-accurate target loads they were using in .45 ACP, .32 LC, and .38 Spl didn't really produce consistent velocities--despite the fact that they printed excellent groups at 50 yards.