The simplist method when I want to change my channel SIDs is to run DreamBoxEdit.
It grabs the channel list from your box. You can then go to your Sky Sports channels or whatever you want to look at.
I go to the main window that lists every channel. Click on the 'Service' tab to sort by Service name, and go to Sky Sports 1HD for example. You will see the 3 duplicate channels, assuming your receiver scanned them. Find the one with correct SID, and drag and drop it in to your Bouquet. Click the FTP button and send the new channel list to your receiver.
That is the way I do it.
The other way, is view all the channels on that box, and view the 3 channels individually and see which one doesn't freeze and glitch. But prepared to be banned for 10 mins if you stay on that channel too long etc...