Base layers- how tight?

Most if not all of my baselayers are a tight fit. Just bought some Craft Windstopper base layers, but sized up based on several recommendations. However, they are a little looser on me than normal, the long sleeve especially so. Reasonably close fitting on the body, but looser on the arms. So, will this impair their wicking ability or not so much?
Titus Silk Road Ti rigid 29er - Scott Solace 10 disc - Kinesis Crosslight Pro6 disc - Scott CR1 SL - Pinnacle Arkose X 650b - Pinnacle Arkose singlespeed - Specialized Singlecross...& an Ernie Ball Musicman Stingray 4 string...
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