Chris can answer for himself but my answer for me personally when I lose a set where I feel I have the best of it is "Flip It - back it up and jack it up". If I really think I have the best of it then over time the odds favor me to win. I have lost the first couple of sets many times only to come back and win more later.
People who WIN giving up weight and then want to give up LESS weight in the following sets are as nitty as it gets. Of course changing the venue changes the game so that's a semi-valid reason for changing the weight. But I have seen people win and then IMMEDIATELY offer less weight. I have seen them destroy someone and offer less weight. It's heartless.
In my younger days when I was gambling a lot I was what the old timers would call a through-ticket. Because if I felt like I had a game I could win then I would empty out trying to win it. No quit in me. I always felt that if I didn't give it everything I had then I would never know if I could beat the guy. Like McCready or some famous player said as they paraphrased Vince Lombardi's line, "I have never been beaten, I just ran out of money."
Well I have been beaten - to the point that I learned that there are people who are better and will always be better UNLESS I wanted to put a lot more into the game than I was willing to. When I think back on my gambling days though the highest highs always came from the times I was up against the nuts and outran them.
No drugs in the world can give you that kind of high - you earned it the only possible way by playing perfect and knocking the other guy out.
That's why I would go back after a guy beat me and try again.