From personal experience the EBC pads aren’t great with anything other than their own discs. They seem to cause more issues than most from what I’ve seen and experienced. But of course that’s just personal opinion.
You can warp discs and it does happen so isn’t just something garages tell you to make money.
It does sound like pad deposition and glaze but could well be warping from extreme sudden heat at the track day.
Very difficult to tell without seeing them / experiencing them in person but there’s a few things to check now.
Hope you get it sorted.
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