Sadly, aggressive tempers are all too common in gold sex-links. Every commercial hen I've had (and seen) for the last five years has shown it, and once they're set on being disagreeable they are difficult to correct. From personal experience, I can say that Gold sex-links are sweethearts with us humans, but have no mercy for other chickens if they don't like them. The best solution is to re-home them as quickly as possible; failing that, cull them.
I would also watch your EEs very closely if you introduce chicks to them, to make sure the gold sex-links vicious attitudes won't have rubbed off on them when it comes to newcomer birds. If you see any of your EEs displaying even a hint of a bully's temper,
separate the chicks from the adults immediately. All the better if you can make it so the chicks can't see or hear the adults. Otherwise, your Gold hens' bad temper will not only have bleed into your EEs, they'll risk transmitting it to your new chicks. That's what happened to me in 2019.
I made the mistake of keeping my victimized juveniles after re-homing an adult Silkie bully who wouldn't let them breathe; the beaten chicks grew up into adults who fell on the chicks that came after them with high prejudice. I couldn't re-home my new bully birds due to covid-19 confinements in 2020, so in less than two years I went from one bully bird to an entire flock of it. It took the entire year of 2020 for my old birds to come at a very grudging truce with the juvenile ones, and they're
still pecking each other more times than not despite that. If I get chicks this spring, I'm going to build a separate coop that's out of sight of the first one so they hopefully won't pick up on my current flock's bad temper. I'd re-home my flock, but I need their eggs so I can't part from them until I can replace them. Fingers crossed that the plan works.
I can't help but wonder though - you say you have alot of contractors on the property? Maybe your Gold hens are reacting negatively to all the noise made by their machinery, and that's why they turned aggressive on your EEs? My hens are sensible to loud sounds, they often shake their heads if I speak in a high voice. Do your hens shake their heads often whenever the machines are active and working?
Best of luck for your EEs and your Gold hens, whatever you decide to do with them