suppose Id purchase 50 new partitions & do some water jug test to compare to your factory 2nds. If the 2nds are a problem Id suspect the lead alloy to be the problem causing either too little or too much expansion. seems like you are suspecting to little expansion.
May wish to start shooting for more surgical shot placement in the mean time. Study up on brachial plexus shot effect.
A Partition is made so that the front expands fast, pretty violently actually.
Usually smearing all of the front portion away. The rear part, behind the Partition is what punches through, usually a small exit.
The last time that bear ate a lawyer he had the runs for 33 days!
