Hope this helps. I still like dry skimming, lol.
There is a great article on Advanced Aquarist Online that takes on this topic. Below is a quote from it and below that the link.
"Both enrichment and recovery have counterparts in the aquarium skimming area. Dry skimming implies very little water hold-up in the foam, and this scenario is more closely aligned with enrichment. Thus, maximizing foam enrichment while dry skimming should maximize impurity removal from aquarium water. In contrast, wet skimming, with its proportionally larger liquid hold-up in the foam, falls more under the aegis of the "recovery" manifold of skimmer operation. That is, the removal of organic-rich foam and entrained aquarium water that contains organics (= wet skimming) should lead to a greater overall removal of the organic impurities in the aquarium water. "
http://www.advancedaquarist.com/2009/1/aafeature2