If you going in that direction. Look at the Woodal's Weird Jack dog or a good male off him. Some very well made up dogs like you already have. If they are good game dogs.

I am not in the know about all these newer blood lines. But to be a good performer they need to be built to perform. Need deep lungs, strong back end and a strong neck. One can try to be game, but when muscle exhaustion and muscle weakness sets in. May not be long before the Fat Lady sings. LOL Cheers