What size of lines do you have (1.5" or 2") and what is the filter type/size. I expect the members with good operational knowledge will be be able to help better with specs.
I believe the rule of thumb is you want a pump that is big enough to turn over your water in about 6-8 hours through a big enough filter to do the job. If you are moving the water too quickly the filter can't do its job. You really don't want to small a filter.
There is some info here, http://www.poolsolutions.com/tips/tip83.html but it is mainly to forewarn over being sold to big a pump. The important point is to get the flow rate the pump gives through your size piping so that you can figure out about how long it takes to turn your pool water over.
There used to be a lot of info available through old posts but I think it was in the old forum info that got lost.
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