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The stiffer hammer spring will do two things.
1. Cause the hammer to hit the knocker (which will in turn hit the magazine valve) harder.
2. Slow the slides rearward movement
1. This is a good thing for high pressure gas setups in hot weather. If the striker strike can't overcome the high gas pressure, you'll get varying velocities. This is a bad thing in that you are stressing the pot metal parts. The hammer will likely hold up ok since it's a pretty large part...but the knocker may not. You'll also note that at the rear of the hammer assembly there is a stub of metal that essentially stops the forward movement of the hammer at the end of it's strike. With a stiffer hammer spring you'll notice more wear and tear on that part and the corresponding contact point of the hammer. Not necessary otherwise (IMHO). Try it out...change it back if you see that things are out of balance or if you don't notice any improvement in the consistency of things.
2. This is a good/bad thing depending on what you're going for. If you want as fast as cycling a pistol as possible then you don't want that. Affects gas consumption too. The slide is the only thing recocking the hammer with the rearward cycle...and it has to push against the hammer spring (via camming the hammer back).
Also note that there is little to no change in "trigger pull weight" by changing the hammer spring. A Hicapa is a single action only pistol (as are all 1911/2011). There is enormous mechanical advantage placed on the sear via the trigger stirrup...so any increase in felt trigger weight is negligible. If you have a positive sear engagement angle then maybe...but on most of them it's fairly neutral. (if you don't understand the last part...and don't realize the importance of the chrome coating on the cast parts....don't mess around with your sear/hammer adjusting engagement angles and break points if you want your parts to last as long as possible).
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