You need brake cooling...via air flow, NOT splashing cold water...
https://www.z1motorsports.com/z1-pro...t-p-21496.html
Get yourself an infrared temp gun and log the rotor temps before and after the brake cooling ducts, you should see a difference.
Rotor is not your problem (unless they are cracking or warping).
EBC yellow shouldn't be a that big of a problem...it's certainly not a full track pad, but they should do the job if you know how to manage it. I imagine you were going balls-to-the-wall Max Verstappen qualifying lap type of driving. Rusty had tracked with them and didn't have any issue.
I think it'll be a great benefit for you to develop more feel and mechanical sympathy for your car.
For context: car in question has TP + Exhaust + tuned. Manual, 3.9 FD and 265/285 tire combo. KW V3 and SPL arms. EBC yellow and SS line. etc...