Graph your charge weights vs. velocities-
Notice how your velocity and charge weights don't increase in linear fashion? Be careful. If that 29 grain charge is accurate enough for you, and burning clean enough, I wouldn't push it much farther.
Right you are. Actually, I'd say 27 grains of BL-C(2) is probably enough. Gets up over 1800 fps, before anything possibly funny about additional powder not predictably raising the muzzle velocity happens.
Not that it's a guarantee or anything, but, brass from all loadings was fine without any pressure signs. (I recall the Lyman manual shows brass exposed to 30% overpressures w/o pressure signs too, but still, it's a piece of information).
I'll probably go with about 27 grains of BL-C(2) for a 30-30 plinking load, I think.