You might want to center the tolerance on the whole bullet diameter. My mistake was ordering a mould that cast .359" with WW alloy and it casts about .3595" with my particular alloy. No big deal, right? Just size it to fit the .3585" throats. Well, the nose band is super-long and any tiny bit of displaced metal deforms the bullet considerably. If base-first sizing, it would get a sharp edge on the shoulder and almost look like an SWC. The displaced metal was never even, and it wrecked the nose shape and balance. Nose-first sizing would rake metal back into the crimp groove. My caution here is to make damned sure you're virtually shooting these as-cast because any sizing at all will screw the nose up. I can only imagine what happens in the barrel's forcing cone if the groove dimension is significantly smaller than cylinder throat.
I tried the same concept with .45 Colt but put a displacement groove in the middle of the nose band and also made it a sort of fat, button-nose SWC instead of a TC design with small radius on the shoulder. Those didn't shoot well at all in anything I tried, probably because the nose was too blunt or weak driving area on the nose bands. I think this concept you're working on is sound in theory but personally I found it impractical to execute. Hope you can figure it out and maybe I'll learn what I was doing wrong.