I don't know about satellite connections, so if the connections drops when using aMule, try lowering the number of max. connections as well as the hard limit. If not, leave these values as they are.
I recommend you to set the upload limit to 28KiB/s (if surfing gets slow, try setting it to 24) with a slot allocation of 4KiB/s. A download limit of 0 means unlimited and is what you should use.
Your computer is more than fast enough for aMule, don't you worry.