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Easy fix -
Contact Wolff Springs, site has phone number, you'll talk with the owner, tell him whether you factory main spring (24lb) is a long one, around 2" long top to bottom or is it a short main spring, around 1" top to bottom with 1" plastic base platform it hooks up to at the bottom (take grips off, you'll see main spring)
Also, get a Sig Armorer DVD it will show you how to change them, (release set clip first) easy, cept you might need a wife, friend, to push new, chosen main spring down as you slip a temporary (paper clip straightened out some) thru the hole to retain it until you put it back up and in, then re-set bottom retainer clip, then pull the temp pin, it will stay and re-insert factory pin, done.
Only tool needed is a pair of needle nose pliers and a small block of wood to set the hammer-strut and spring onto to (after you take it out of gun) and take off and put back on, then after you take it out, and when you change the spring, then put it back up into gun.. fixed to the hammer strut, centered on bottom of hammer pivot point, press retainer clip back in bottom, it slides up then down into set/locking position..
Put a touch of oil on the top and lower part you see dipping down as you pull a DA shot or thumb-cock hammer into SA mode, and goes back up when you deccok or pull the trigger..
Really, watching DVD makes it, "shows you" how easy, step by step this really is.. takes all but 3 mins..
Wolff sells a pkg set: IIRC 20, 19, 18, 17, 16lb main springs so you can find what you like, then test thru 500 flawless rounds to ensure no light strikes- none, if you get some, go a pound heavier.. re-test..
It will lighten the DA pull considerably and you'll like it.. I use a 17lb on one of my P229's and a 18lb on another.. both with over 4000 flawless rounds thus far with lighter main springs and much smoother, quicker, lighter, DA pulls..
Ls