do you have Reason also? there is a nice snare called the Knox wich i like the attack.
I don't own battery and kontakt, but the tip i can give you is to stick with only one decay but to mix different attacks together until you get that tight hit going on.
Since these are samples, i suggest compressing them with volume automation insted since the result will sound better and exactly how you want it to be.
If otherwise you wich to compress a sample, especially the ones that will serve for your attack, i suggest setting the realease of your compressor really slow and the trehshold quite low, so it completely isolates the attack from the decay.