[Ben Dawson]

Thinking about sfx to add a finishing touch to a mix is all fine and dandy, but I would suggest making the mix itself a tight as possible before even thinking about sfx in you mix. It is very much the last thing that should be considered.
Equally, I do believe that asking Danny to do his thing with the scream is the best bet, 'cos the current soundbite in your theme sounds rather dry, and too loud, and not enough reverb. I do believe the tail end of it has been cut off as well.