I know this has been addressed before but I've got a Hakko 888 soldering station with a 5.2mm tip and I'm trying to unsolder the stock power wires so I can lay them down a bit more.

I'm not even really putting a dent in the stock solder at 675deg for 10sec with a freshly tinned clean tip.

I'm kind of worried I'm gonna do some dmg if I put much more heat into it. Is there some black magic to get them unsoldered or do I just blast it with heat and pray for the best?