Have you tried my previous suggestion on increasing number of peers? If some peers don't cooperate, this could be a problem. Make the limit 50 both ways (per torrent and global) and try a torrent that has quite a few seeds/peers, make sure it goes smoothly. Perhaps choose a local torrent, some peers are from the other side of the world and have high latencies.

Also, try to stop and restart the torrent if it insists on being slow, this re-connects all peers, hopefully other peers.

Also, no worries, we' cool.