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The amount of values fetched with a single call is a configuration item. Please see Restrictions on request data rate.
You can however specify a different maximum with your query. Please look e.g. for maxCount for the GetRecorded call. So try adding ?maxCount=5000 to your query if you like to enhance the default to 5k.
For your second question, please allow me to mention that you need to configure PI Index Search Crawler to crawl your PI Point database. When searching for PI Points it helps when you have an index on the field used in your search. By default the following attributes become indexed:
Please see the following sample that is supposed to return all PI Points with pointsource=y