skimmer setup secrets?

[makana]

I've had two eshopps skimmers and they both where fairly easy to adjust but require very small adjustments. I find them very sensitive to changes. If I stick my hand in the tank it kills it for about an hour. If I stir up a bunch of detritus when cleaning it will overflow like crazy. The first one I hade would get salt buildup in the venturi and overflow when the air intake became partially blocked. The new never has that, don't know why.

I also find that it seems like because my bio load it so light for the size of skimmer that it is difficult to get great results. But it also isn't a high end skimmer.