FWIW, I went through all of this with my suppressed Kuehl dedicated upper on my M16 lower. Put in the full Lakeside kit - cut a little bit off the LS recoil spring, used the mid weight trigger spring, and the lighter weight disconnecter spring. Still was getting light primer strikes using the bulk pack high vel Rem ammo. Finally had my gunsmith check and adjust the sear timing down to the gnat's ass, and now it runs about as well as any other dedicated 22 upper I've ever seen: about 95%-98% using the bulk Rem ammo, which is not as reliable as the CCI std vel. It's less reliable FA with the Rem subsonic, but shoots it fine on semi. If I were you, I wouldn't worry about the reduced power trigger spring in the lower. With a 5.56 upper, mine still runs like a raped ape, even dirty and with hard primer mil spec Q3131 ammo.
In summary, if you put the Lakeside kit in and are still getting light primer strikes, check your sear timing, and perhaps use better ammo. Hope this helps. Griz