In this work, we present a new data mining (DM) approach (called tuned clustering analysis), which integrates clustering, and tuned clustering analysis. Usually, clusters which contain borderline results may be dismissed or ignored during the analysis stage. As a result, hidden insights that may be represented by these clusters, may not be revealed. This may harm the overall DM quality and especially, important hidden insights may be uncovered. Our new approach offers an iterative process which assist the data miner to make appropriate analysis decisions, and avoid dismissing possible insights. The idea is to apply an iterative DM process: clustering, analyzing, presenting new insights, or tuning and re-clustering those clusters which have borderline values. Clusters with borderline values are chosen and a new sub-database is built. Then, the sub-database is split, based on the attribute with the highest Entropy value. The tuning iterations, continues until new insights were found, or if the clusters quality are below a certain threshold. We demonstrated the tuned clustering analysis on real Echo heart measurements, using km-Impute clustering algorithm. During the implementation, initial clusters were produced. Although the quality of the clusters was high, no new medical insights were revealed. Therefore, we applied a clustering tuning and succeeded in finding new medical insights such as the influence of gender and the age on cardiac functioning and clinical modifications, with regard to resilience to diastolic disorder. Applying our approach has successfully managed to reveal new medical insights which were restored from borderline value clusters. This stands in contrast to traditional analysis methods, in which these potential insights may be missed or ignored.