Yep. Those are the Wolfe springs. The only one that is really necessary to reduce the trigger pull is the trigger return spring. I believe that it available by itself directly from Wolfe for $8 ( Wolfe link... ). Try bending the legs on your existing springs first if you choose to go this route. If you ruin it, buy the $8 replacement one. Bending the factory spring will give you the same result.

Again, I tend to stay away from the reduced power hammer springs unless absolutely necessary. They will have two effects:

1) They increase your lock time slightly.

2) They reduce the amount of energy being transferred to the firing pin and can cause misfires.

Neither of these will likely cause you a problem, but I always envision a guy dropping the hammer on the hunt of a lifetime only to hear a click because of a weaker hammer spring. Likely to happen? Probably not, but it isn't necessary to get a good trigger job so why take a chance?