As for the pads;
I do similarly; just hammer the tabs over; that is what they are there for.
As to the rubbers;
installed into the grooves, I lube them with a silicon O-ring lube.
As to the "ways"
if they are hammered or grooved, I braze them up and adjust the fit.
On my personal cars, I don't care about any caliper-to-pin rattle; I know what it is and the rattle tells me that the thing is not seized.
