There was a similar thread earlier. OP I suggest looking at past threads for many answers you may seek.
Many things have been covered by very knowledgeable people in the past, and obviously there are qualified folks here now as well.
I wrote this response a few days ago, and though its not directly related to your question, it echoes what Absolutely April said here.
Everything is really a snake to snake situation. There are plenty of HUGE BCI boas.
In the wild the largest boas are the oldest boas. It has been found, GENERALLY that BCC boas tend to be larger as adults than the other boas.
Many BCI "common" boas are not common at all. There is mixing in captivity and also natural intergrades that have both BCI and BCC traits.
I would consider a big boa to be 8 feet and over.
Boas are supposed to grow slow. In nature they eat infrequently and have evolved over millions of years to be able to sustain themselves on very little food.
Boas in captivity that are fed large quantities of high fat, captive raised prey will almost always grow quickly and die early.
The focus of any passionate boa keeper should be on health and longevity VS size.
A healthy, long lived boa will grow to a respectful size as it ages.
There should never be a rush to create a large snake of any type.
If you want to own something that will ultimately end up on the bigger end in the boa world, a BCC with Peruvian or Amazon basin roots will generally get there.
Pokigron, Suriname boas tend to be a smaller locality than the Basin Guyana and Suriname BCC.
A nice 6-7 foot boa is a lot of snake. Impressive, handleable and not overly imposing.
There are specimens that can hit 10-11 feet and weigh 80 plus pounds.
What you should take away from the above is this.
Feed a boa like it eats in the wild. Seasonality, which includes light changes, temp changes, feeding frequency and other subtle habitat change is the key to long term success.
Vincent Russo wrote THE COMPLETE BOA CONSTRICTOR, it is a book I highly recommend.
Your boa will grow, but let it grow at its own pace.
Even if your snake may be a little larger than average now, you can still keep your snake healthy by making adjustments in feeding.
Good luck.
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