When desoldering anything, you must limit the amount of time you heat the connection to avoid damaging the board and lifting traces.
Heavier connections take longer, but I would limit heating time to less than 15 seconds on even the heaviest connections.
The idea is to heat the joint, suck, and get out as quickly as possible.
To speed up the heating process, good thermal contact is a must.
I wipe the iron tip with a wet sponge, then apply a tiny amount of fresh solder to the tip to get better heat transfer. Once you tin the tip of the iron, you have about 20 seconds before the solder oxidizes to the point where it needs to be redone.
Another important point: The traces with heavy solder buildup take a lot of heat to melt. It works best to heat from the heavy side.
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