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Your house and attic may have been MORE loose and drafty B4 the insulation was added. If you have extra humidity now it can be because the AC is not cooling properly and removing enough humidity. We get the same problem where I am when we put in high efficiency furnaces and get rid of the chimney. House is more airtight and saves NRG but the humidity is trapped in the house and goes up. I would go HDepot and buy a high quality Bionaire table top humidity gauge (hygrometer) to see what the humidity level really is. DO NOT buy the el cheapo ones as they are notoriously inaccurate. Can be out as much as 5-10% RH as compared to my Pro gauge. Get them to check the freon level and make sure the AC is cooling 100%.