It sounds like everyone is very much on top of very good advice - let me just throw a couple of .cents in. Re the direct topic, the owning up when confronted.
Okay, you've stated your W is a perfectionist, but what is your perception of her - do you think she's "perfect" (not in the R of course). But I am willing to bet that you, in general, think she's very good right to the last detail at things she sets her mind at. And I am also willing to bet that you are a generalist, "hey looks pretty good, now I can get more accomplished over there". It's my simple opinion that to solve the lie(ing) problem you just need to understand that you and your W probably even each other out well. Instead of looking at her perfecting as THE only right way, realize you offer just as much to the task of everyday living - just in a different and possibly more refreshing way.
This is the R my H and I have/had and I understand ALL TO WELL the split instinct feeling of "oh crap, here comes THAT look again!" and opting out to say what you think they want to hear and maybe you can fix it before they notice you didn't do it right the first time. It's really just a matter of realizing they are your mate/friend/accomplice in life. Not a teacher/parent or someone you have to look up to just OVER to. You accept and get comfy with yourself and all the wonderful things you bring to her life and she will probably follow suit when she realizes "Hey, he's not a perfectionist and it wouldn't be fun anyway if he were"
