I mean how many indexers do you have, not individual indexes. I had a problem where I wasn't searching my cluster correctly and always missing results or having duplicates.
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For eventtypes, I have been doing exactly what you are describing with no issues. I use this for my time range as it is a bit easier on the eyes.
host=myhost1 sourcetype=Source1 earliest="05/28/2015:08:00:00" latest="05/28/2015:12:00:00"
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