Overstabilization can cause accuracy issues if the bullet isn't perfectly balanced. As Jordan said, that's usually not a problem with today's bullets. Too much stabilization also means high RPM's so fragile bullets can suffer jacket failure and spin apart. I have a 20 practical with a 1-8 twist that will spin apart 39 gr. sierra blitzkings because of the fast twist, a tougher bullet like the 40 gr. Vmax won't fail. That's also not a factor with a Barnes, you're not going to spin them apart.
As long as they shoot good, don't worry about it.
