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The reason there are so many Ruger upgrades is because they're necessary.
I would try following the directions a little more closely and if not satisfied with the results I would replace the trigger with an aftermarket.Be sure of your angles as they are critical here, keep them sharp and flat or beveled as directed, if they are sloppy the trigger function will be unpredictable, go back over everything you have done and compare closely with the illustrations and read the directions again to insure that you have a complete grasp of cause and effect when changing the angles.
What is not specified in the instructions is if you modify your trigger to his exact specs what trigger weight you will end up with. Unless I just missed it. Where he specifies a 90deg angle what did you end up with?