My slowest growing/smallest Star definitely has more bumpiness than the other two faster growing stars. You would think it would be the other way around since people relate growing them fast to pyramiding. It looks to me like some are just more prone than others to pyramiding. Although, I think the 80 degree minimum and 80% humidity seem to reduce pyramiding greatly. Also, my sample size of three is really small. So, we would get better info from someone who has raised up more platynota.