Although I don't have experience with v11/x64, I have always used 1280 min/max for all of our Hyperion (9.3.3) JVM heaps.
You may also want to consider the Essbase angle, take a look at two functions in MDX called NONEMPTYMEMBER and NONEMPTYTUPLE (just Google for more info, they are also in the Essbase documentation). In a complex ASO cube retrieval, sometimes using these can significantly cut the retrieval time. These act as a filter for certain dimensions, if they are empty, it won't execute the calculation and move to the next.
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