to the contrary, when you double the engagement surface, you INCREASE the trigger pull, not decrease. That being said, one must not confuse a real single hook, like the Arsenal type, from a double hook with one arm cut off - like the TAPCO. They are fundamentally different.
The double hook is a 2-stage. The (real) single hook is a long single stage.
3/4 of the way through the trigger pull on a 2-claw, the disconnector contacts the back of the hammer and adds the disconnector spring weight to the last 1/4" of pull.
the (true) single claw does not.
a similar function can be added to the true single claw such as on the PSL bu a small dip right before release - the Arsnal USA unmodified have an obnoxious but on both the hammer and trigger which dramatically increases the pull right before release - not a 2-stage, though, just a defect in the casting. On some, they removed it. can tell by sniffing for cold-blue.