I play a guy weekly. He's a better player than me, but he gives me some weight and we play short races for cheap, really cheap. It's more about practice and getting better or staying sharp than it is about the money. When we started playing, he gave me the 6. And at time, everyone who knew both of our games thought I was taking the worst of it. I don't suck that much as that he can play that good. We're talking about Cole Dickson's road partner here. Fast forward a few months to now, and I'm getting the 8 and still winning. Everyone thinks I'm outrunning the nuts, but a few things are going on. First of all, we play on a Diamond table with 4" pockets. This is pretty much all I've ever known. People go on and on about how tough this table is, and I simply don't give a f***. I play this table the same as I would any other table, while this guy lets how tough this table is supposed to be get in his head. Second of all, even though we play for super cheap, I feel every penny of it. I'm a pool player trying to get through college, he's been in pool all his life and has played (and still plays) for thousands. He doesn't feel any hit from losing to me, while I feel everything.
My point is, I'm up winner almost tenfold. I've come out loser 2 weeks out of I don't know how many. Every single game I'm supposed to lose. But I find a way to win. When he wants to adjust, I adjust. In doing so I'm keeping my practice partner, but also keeping a game I'm winning at. I've improved a lot since we first started playing, which was the entire point to begin with, but I've also won a good chunk of change for someone of my economic stature. If I refused to adjust, I wouldn't have a weekly game with a chance to put some money in my pocket, but more importantly I wouldn't have a strong playing partner to help me get better.
I guess it really depends upon what your motives are. If you're trying to make money and you have action out your ass, then stick to the game and tell him to win it back the way he lost it. If you don't have action out your ass, and don't want to lose a good thing, adjust and keep playing. Show him you're willing to work with him, and hopefully if he starts getting the better of it he'll be willing to readjust for you as well.