Get a set of metric feeler gauges and measure it more accurately. It is easier to do the math and eliminate errors.
Paint remover(or gasket remover) and a plastic scraper will get the old gasket off. use the old clemical stuff not the new environemently frendly...
EBC parts are not junk, they are one of the best in the aftermarket for brake and clutch parts. Buy a set of plates and a NEW set of heavy duty...
I clicked the buy it now button and i could purchase it.
I know you concerns about parts. I have several parts bikes and many bins of spares.