With the previous forum software you had it configured (or maybe had an addon) to merge consecutive posts by the same user. Xenforo has an addon to do this, and it appears to be free. Would you guys be willing to install this addon?
[WMTech] Double Post Merge 1.3.1 | WebMachine Technologies - Quality XenForo Add-Ons and Plugins
[WMTech] Double Post Merge 1.3.1 | WebMachine Technologies - Quality XenForo Add-Ons and Plugins