I see that I didn't really answer your question. The boa looks to be in fine health, and not every BC be it male or female will be a giant.
There is certainly sexual size dimorphism between males BCs and females, however I don't see many reasons why a "shoulder pet" non-breeder, male can't attain a decent size. Using somewhat warmer husbandry practices, within the reasonable guidelines, and feeding larger prey items, you will probably see some increased growth if that is your goal.
Your boa is at an age where the accelerated growth spurts are probably over, and a slow, steady growth pattern has taken hold.
I have no idea what the previous situation with your BC was, or how it was kept, or what's in it's genetic background but I don't think it would be a stretch to see it reach 6 feet at some point if you are raising it like a "shoulder pet".
I say all of that with a bit caution, as I'm not recommending an aggressive feeding regime or extremely warm temps with no break in the cycle.
Get to know your snake, don't be overly eager to feed it even though it's interesting, easy and fun.
IMO fat boas are absolutely horrible to look at, and BC's that no longer have the unique lateral compression (loaf shape) have not been cared for properly by their owner.
Shoot for a long lived, healthy BC and the growth will come.
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