Originally Posted by 3alarmer

.
...the only thing essential to the quality of your bicycle's ride, related to the seatstay (and whether it is bent or straight), is where the rear dropout ends up in position to the rest of the bike. I have had a couple of frames that had some issues with the seat stays, and one of them even had the seat stays on each side of slightly different lengths. But they were eventually adjusted to ride fine, with no "wobble".

So as stated above, you might have a different thing going on. And your stay problem might not be much of a problem at all.