A friend has said that to me as well, an Aussie with a deep voice. All you could really hope for, if you're unable to enunciate or use small pauses to get around it, is some workaround like using another phonetic based command to call the command you have trouble with. Watch the event log in Voice Attack and note the words it think you are using, and add them to a phonetic list of words you can substitute as command words to make them fire correctly.
For example, you can make a command for "Body 8 2;Body 82;" and translate that to A 2 and call the correct command. Certain words will have issues, so having another way to call something can help, too. VA can wait for a user input now, so a simple If statement could be used to have VA ask what you just said, and wait for you to quickly type an "A" or an "8". There are obviously many ways to try to create a workaround, but in the end, it's the current "wall" for voice recognition and control in the current year: foreign accents, regional accents & dialects, deep voices, and speech impediments are just not fun to try to work around.