In the menu for the Triton make sure the peak detection setting is at least 6mv and that your safety timer etc are not to low.
I just got one from someone that said it was useless and the cause was he had it at 3mv settings which means it will always false peak.
Nimh can sometimes take 3 cycles to form up.
The Triton is as good as any out there, I have gone out and paid 350 for one that performs no better.
Also if yours does not have a yellow or green sticker on it it may need an upgrade ( free )
I have also found that it performs better if you set up the battery in memory and adjust your parameters there. Left on auto it defaults to very safe settings.
You can do a forming charge with it by turning up the safety timere to either off or at least 10hrs, turn the peak sensitivity to its highest ( Dont forget to put it back!) and the capacity to much higher than the battery and lastly set a C setting of a tenth of capacity.

Silversufer is spot on about the leads, get good ones ( Hobbicos have a tendancy to break internally ).