thats odd... i didn't have any such issues with mine. you install the crank sprocket on backwards? is the back of the sprockets flush with the crank/block.
if your dead set on getting a different set get a rollermaster.
JP sets are IMO the nicest timing sets you can buy for a slant. and do you have any experience with a slant JP set?? and there is nothing wrong with having the sprockets slightly machined, not that .100 is slight lol