negative angle is dangerous because it puts some of the hammer spring force onto the sear spring. it only takes a little of this to increase pull weight, but with it there is next to no risk of the gun going off due to shock, because the weight of the hammer spring locks the sear into engagement. The engagement angle is generally positive from the factory meaning as you pull the trigger the sear actually cocks the hammer back slightly. another thing you can do but be careful with this one is to improve the sear engagement angle and amount of sear engagement surface. this will make the trigger pull feel nice and glassy. If you feel comfortable pulling the lower completely apart you can polish all the engagement surfaces. dirt will make the trigger pull feel heavy and spongy.
The first key to a good trigger pull is a clean gun.
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