[jcp123]

Fuel trim reading 1-3% lean wouldn't raise my eyebrow at all. Have you looked at the spark plug again since driving it more? Wet and gasoline smell could well be because the engine was shut off on the intake stroke.

P0420, in my experience, rarely lies. I'm sorry I forget what instrumentation you have, if you have an Ultragauge I know you can watch O2 sensor voltages. The data resolution sucks but should be passable for seeing if your downstream sensor is switching or holding fairly steady. Other instruments may have this function as well, I just don't know.

Do check the spark, just to be on the safe side, but if you had a serious enough spark issue to burn up the cat, I'd think you would see it on the fuel trims, and under 3% correction for your long terms is great; the rule of thumb I've heard is that more than a 10% correction is when you need to start worrying.