With all due respect, you should have tried out the trigger by dry-firing it a couple of dozen times before you bought it.
There's nothing that I am aware of that you can do to shorten the length of pull, and a 2.5 lb trigger is asking for trouble, even if it could be safely done. This is a combat pistol not a match pistol. 3.5 to 4 lbs is as light as most people want a combat trigger to be. I think you are looking at a ND in your future if you monkey with the trigger weight to make it lighter
As for comparing it to a M1911, the geometry of the two fire systems is completely different. The 1911 lends itself to modification and striker-fired guns like the 24/7 not so much.
Shooting a few hundred rounds through it will smooth out the trigger and you will become accustomed to the weight of pull.