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The most effective mod is the standard one, which gives you almost double the flow, any other added mods will only give marginal improvement, for example cutting slits on the underside will give you maybe 100 gph more flow max. Thinning out the grids isn't worth the trouble either IMO. It destroys the look of the pump.
For flow tests, I know it is a hassle to read the whole thread but detailed descriptions are all in there, if you are determined to do the flow tests yourself, the reading part is easy in comparison.
A few people asked me how to do the controller mod. I do not recommend it since the improvement (from 30% down to 15%) is not worth the trouble and you can not return the controller to its original condition after the mod, I had to cut out the knobs in order to open up the controller. I removed my controller mod right after the test and put it in regular use.
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