Better to manage the problem, rather than beat it to death, which is the VBL approach. For one thing, sweating is caused by over-heating. You say you've worked with layering, but if you're still warm or too warm, keep peeling until you're comfortably cool. If it's around ten degrees, for instance, and you're working moderately hard, a lightweight long-sleeve top like a Patagonia Capilene Zip T ($34) should be fine. Otherwise, look for new-generation fabrics that do a good job of wicking. Polartec Power Dry works very wellREI puts it in a zip T called the...Power Dry Zip T (wow, original!) for $36. For an insulating layer, some of the new Polartec fabrics such as PowerShield breathe well while wicking like mad. Arc'Teryx's Gamma SV Jacket ($240) uses it. These fabrics also dry very quickly, so once they're wet from sweat they don't take too long to lose moisture.
You may have to experiment a little. But, I'd definitely stay away from the VBL. It's not the way to go.
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