Hopefully the match will work out! They really do enjoy company. Your mention of finding past dominance behavior stressful makes me think that it's really important to look at guinea pig behavior like you are another guinea pig and not as if they are human beings. I think as people we would be stressed out if we felt 'bossed' by someone we lived with and we tend to feel bad for the underpiggy because of that... however, guinea pigs are wired to live in a hierarchical group and what looks mean to us in terms of seeing dominant pigs assert dominance may actually be security to them, as they need to understand where they stand within the group. Of course, there are cases where pairs don't make it and there is actual physical fighting and risk of injury where they need to be separated for their own good, but I think it's important for our own wellbeing if we keep on reminding ourselves that guinea pigs themselves don't feel 'bullied' by normal dominance behavior, and in fact need to know where they stand in relation to other pigs, as it's how they are wired to interact.