If/when you do move them into a bigger cage, ensure you use soiled bedding from the original cage. Any new environment and territory will cause them to reestablish their relationship and hierarchy. In well bonded pairs it amounts to increased dominance for a few days and then calms down. In pairs where there may be issues, and a teenage boar trio would be one such situation, the move, having to sort out their relationship and new territories can actually break the relationship. Using soiled bedding can help them recognise it as their own space and hopefully make a move easier
There is a section in this guide about new environments etc
A Comprehensive Guide to Guinea Pig Boars