I read your post quickly, so I may have missed some things, but here is some help.

It is normal for boas to grow at different rates. Most of my Boas are '04 so I will discuss the differences there.
My female poss het Blood is around 5 ft. and is fed once a week, her brother, on a similar diet is 3.5 ft. Then there is my albino she is a little one at 3ft., and then my female poss het Leopard is right between the Blood and Albino.
My Hypo female is around 4 ft. All of my boas are fed weekly, unless they look like they need a week off, or are in shed.

I would not worry about a size difference, it is normal. Especially between males and females, since female mature at much larger sizes.

I know my group isn't the best example due to the variety of locales, but gives you an idea.

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