Argent, there is something wrong with the amp. It is not your load. It is in need of repair if it gets that hot on one side.
My 4B-ST runs Hot
4B-ST owners, does your amp run hot? After an hour or so of listening at moderate levels my amp is so hot on top that I can't keep my hand on it for long. I do not think I am pushing it that hard, but I might be wrong. My speakers are some small floorstanding PMCs (FB-1). Curious if anyone thinks this is normal or might be a problem?