Stimulators

Stimulators don't completely cut out the negative stat possibilities out but rather just convert them to zero. Like if you had a weapon with a variance of 5 to weapon attack, you would have a range of -5 to 5, or -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5. The stimulator just converts this to 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, so you have a bit more than a 50% chance of getting an average result on a specific stat (not to say that getting +5 is equally likely as getting +0, I'm just assuming the chances are the same for both ends of the variance).