I have a weapon with Impact on it, when I cast Lead Blades and add the adjustment in Hero Lab, it gets the bonuses as well. According to the Paizo FAQ, since Lead Blades is one of the spells required for Impact, it does not stack. So the Lead Blades adjustment needs to check the abilities of the weapons and ignore those with Impact.
This has already been submitted as a bug, I thought it would be good to mention it here.
David
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