OK, so to increase the probability you want to approach zero, which means incrementally adding positive values to your negative values indicated by -0.3010 and -1.7324 just for your 1-grams, 2-grams and 3-grams above TWENTY (just edit them directly in the file referenced above and use that edited .arpa file rather than the .DMP in startListeningWithLanguageModelAtPath:). I would set up a test to try to find the threshold where you stop experiencing the bias towards the individual values by incrementally adding the same small value to all of them (say 0.0100) until they are large enough that the recognition behavior changes to your satisfaction. You can test against the same input by using the pathToTestFile test capability of PocketsphinxController.