In the past CG made a point to try and normalise rewards a bit to make it so the guild grows together rather than fighting eachother for placement.
Look at the difference in shards for OGHan and GK.
This wasnt too bad with Sith Heroic as could get a full G12 piece wherever you land just more likely if at the top.
Now with G12+ they have made it so above 10 can get a full piece only and lower places can only get salvage. When you have a guild where some people have 5/6 full pieces on their team and others have have 0-1 then there is a massive discrepency on it. Especially when you have different scores from different phases.