In exploring deliberative dynamics within mini-publics, it has been observed that initial group-building activities play a crucial role in enhancing deliberative reasoning. However, the influence of liberal democratic practices such as voting mechanisms and the inclusion of strategic or representative stakeholders, on deliberative processes is not well understood. This study undertakes a comparative configurational meta-analysis (CCMA) of 22 minipublics to investigate how these liberal democratic elements influence deliberative reasoning. Results indicate that participants’ deliberative reasoning is significantly enhanced in contexts where initial group activities are coupled with prolonged periods of deliberation and where voting is minimised or absent. In contrast, the presence of voting mechanisms, strategic stakeholder involvement, and a high impact of minipublics on decision-making processes are associated with weaker, negative, or stable participant deliberative reasoning. These findings contribute to the broader discourse on the integration of deliberative and non-deliberative components within minipublics, highlighting the potential negative impact of strategic behaviour on the quality of deliberation.