What make of discs and pads did you use ?
Did you get any rust build up off your the hub face ?
Did you check hub run out with a dial test indicator ?
Very often with new discs that re warp it’s because the hub face is not flat and square , you fit the new parts and all seems ok until a few heat cycles and the discs starts to take the shape of the warped hub .
Another one .....do you ever coming flying off a motorway and do mega braking to the end of the slip road ,then sit there at the junction or lights or whatever with your foot still on the brake pedal .....this can put massive localised heat into the area of disc where the pads are clamping it ....this can set off a warp issue .
Another one .....DTV.... disc thickness variation , on bedding in new discs and pads they normally have a bedding in surface , in some cases if not done properly the cementite in the pads can bond to the disc causing DTV ....it gives same symptoms as warped discs ...pumping of pedal
It’s said that your not supposed to use copper slip between the disc and hub face it should just be clean and grease free , if anything don’t use copper grease where you have metal and aluminium together e.g aluminium wheel , aluminium calipers and so on..... copper between diss similar metals can cause galvanic corrosion , there are non metallic greases for these purposes like Ceratec , copperslip is ok where it’s metal on metal .
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