From what I have heard it is not likely that you will ever be able to train your brain to see the target correctly if you see double when using both eyes open. When I first started shooting trap I tried hard to keep both eyes open. I would always see two clay pigeons and would miss. Once I took my handgun training class, my trainer told me that it was unlikely that I would be able to use both, even though it is optimum. She likened it to trying to train a left eye dominant, right handed person to learn to be right eye dominant. It is just the way you are wired. Now if you don't have the issue of double vision, perhaps it is just a retraining thing. I Jane learned not to close my left eye all the way, but to squint it and use my right eye to aim.
I don't expect everything handed to me. Just set it down anywhere.