I've been concerned about my uploads as well, since they've been failing more frequently and when they do run they're as slow as shit. I ran a test from
www.dslreports.com and came to the conclusion that my isp has capped the crap out of my uploads; either that or the service is super-bogged down at the time I'm running SLSK.
On the cfg file front, I dunno, but when I upgraded to 139, that really when most troubles began.