How should I choose parameters?

I have 1,200,000+ sentence pairs with a big dictionary which contains more than 1,300,000 phase pairs. All my data have been checked for several times and they are very clean. If I want to get a good model for industry use, which options should I use? I’m training a model with 6 layers and 1000 rnn units per layer now, and I’m not sure whether I should use a bigger dropout rate or vocabulary size or not. I have much memory on GPU I could use, because of OpenNMT’s efficient memory usage of course.
Thank you if you could give me some advise.

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