I'm with you, at least as it pertains to the 13# hammer spring. I just installed CGW's 3-spring kit in both my P01 and P06. I can't really feel the difference either, certainly not a 50% reduction in DA pull. I'll be interested to see how your next spring feels.
I did get another 13# blue from CGW and replaced it with the first 13# blue spring and there is no difference at all in the action between the 2 blues (not that IO did really expect something discernibly different!). Like others have already said, the other trick to getting totally buttery smooth is by doing other types of wizardry (hammr, sear, very good internal polishing...).
Interestingly I just picked up my RAMI and with all the OE components so far, it is doing the exact same thing but obviously the P-01 with the existing CGW parts requires less trigger pull force than the RAMI with all OE. I will also change over the same components for the RAMI despite having sworn not to before
So here is how it goes for the trigger snobs and perfectionists:
In SA as the trigger is being pulled as certain amount of uptake or slack is notice which is normal till the action hits the wall where the shooter feels that the sear's engaged. Then comes the creep toward the break and if you keep pulling the trigger ever so gently, you will feel that very short travel of the trigger toward you that the creep feels a bit gritty before the gun goes BANG!
Most of the above will feel like a smooth action when firing live rounds at the range or I would imagine when adrenalin rush in the system under duress. Oh the luxury of snap cap dry firing and these 1st-world problems