Well, it doesn't seem to me that you can get some help with this kind of problem through web and forum. I would suggest to you to consult a pro, best someone experienced with fearful aggression (what you are describing does seem to be driven by fear mostly), best in so called "primitive" breeds.
Also, I don't think alpha-rolling will help you at all, your dog doesn't seem to have enough trust in your ability to solve the problem he is afraid of. Your position of alpha shouldn't stem from your power, but from your authority. The dog has to believe in you, if you know what I mean.
But it is very hard to advice online, especially in this case, I think it is pretty complicated.
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