I wish I was lucky as you. I found guys are much more friendlier and accommodating than female agents.
I came back from Paris in January. At O'Hare Chicago, I declared everything I bought, a total of 18,000 Euro (more or less, can't remember now), including a Kelly and a skeleton bag from Petite H. I took a lot of efforts breaking down my purchases into categories and writing on a piece of paper as suggested here. Unfortunately, I ran into two female agents. I almost felt they were jealous about the money I could spend. They kept me there for more than one hour, checked on their computer individual tax rate on every single category I listed on the paper, and asked me many questions. They did not give me any break. I ended up paying more than $1,200 for the duty.
On the other hand, my friend, who traveled with me at same time, declared slightly less amount than mine, including a Kelly, a Chanel WOC and a LV speedy. The amount she spent on leather bags were actually more than mine. She also wrote everything on a piece of paper. Although the male agent asked her about receipts, he specifically told my friend that he appreciated her honesty and would only charge half of the duty rate for her bag purchases. My friend only needed to pay $600 and got out half hour earlier than I did.
I felt I got penalized by honestly listing and declaring everything. It's a very bad experience. I am not sure I'd do this any more.