First of all, Welcome.
(True) Nicaragua's are dwarfs, they stay significantly smaller than most other boa's. Currently own a 5 year old male, a little under 4 feet long. And a female thats turning 3 this year, she is a little under 3 feet atm. Both with completely known lineage. I have never seen a true Nicaragua male grow past 4,5 feet, or any true Nicaraguan grow past 6 feet. Unless you overfeed them a lot, they should not reach that size. It could be yours is an exception, as they say there is one to each rule. However if your animal grows to 5,5 feet, i
Personally would seriously question his lineage, wouldn't breed with him as a 'Nicaragua'. When it comes to vivs, bigger is better. However my adults usually stopped climbing.