NiMH charging problem

Has anyone else experienced the problem outlined below, and has anyone got a solution?

I bought four GP3300 packs, discharged them one at the time, then paired them to give 14.4v. I then charged them with my ProPeak Constallation charger at 12cell and 2A. They only take about 320mAh before finishing, I have to do this over and over to get up to 3300mAh capacity. Both pairs have this problem, funny thing is that when I discharge them with the charger they continue without a break until finished at about 3500. Ive also tried charging at different currents up to 4.5A, always the same result.

I had a similar problem with Alphas 2400 NiCads, hence why sometimes (first round of winter tour and at colchester) the batteries go flat after only taking about 250mAh. At first i thought it was because they were new and was part of the cycling process, but strange how they did it again after nearly 6 months (Although hadnt been used for a while). I found that if you put them on automatic they seem to fully charge, but when on manual they didnt, i wasnt keen on the auto function for them as it was trying to put 5Amps into 2.4Ah cells, but seems to be the only way for them to take charge.

Alan