charging at 5 amps is fine. discharge at a high ampage if possible, somewhere around 20A. discharge the cells to 0.9v/cell, so 5.4v for the pack. If you go below this is can damage the cells.
were they new packs or second hand? if they are second hand they they will be a bit dead as NIMH drop off quite a bit after 20 cycles or so.
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