They were very tight in the caliper I thought, but the bloke who was cleaning them (the one who did the cut) said that was normal as if not they'd rattle.
This might lend a clue.
As you have replaced pads and disks, had disk skimmed they might be ruled out.
The callipers (and wheels) are the common factor. Struggling to think how misaligned wheel fitment might affect braking, but still worth a look. Hub to wheel mating surface must be flat, clean, paint and dent free. The wheel mounting flange should be clean bare metal not painted.
On my 3200 the calipers were defective causing pads to bind. This caused uneven pad wear, poor braking and heat! Temporary solution was to grind / file the edge of the pads until they glide in to place. If the pads stick in the calliper, they will remain in contact with disk surface even after the brake pedal is released.
Eventually I Swapped out the callipers and will have the old ones re-built, No more braking issues. BTW no need to get stung with OEM brake pads, there are lots of suitable alternatives. I started with a Ferodo pad which used the identical friction material and have progressed onto Green gripper and finally EBC.
my two cents - but get a trusted local mechanic to give thew brakes a proper re-assembly. Any decent mechanic will autonomically detect and fix these simple issues.