c good,

You may find, if using replacement springs for both main and rebound applications, you could get a very light SA trigger, something on the order of 1.5 lbs. I, personally, consider that a bit of a liability. If you have, or can borrow a trigger gauge, test both SA and DA pull weights before doing any work, then again after spring(s) replacement. This will give you a baseline to measure your changes.
After changing both springs in my 28-2, I found the SA pull to be about 1.5 to 1.25 lbs. I went back to the factory main and used the #14 rebound. I lightly stoned the surfaces indicated as per the Miculek trigger job DVD. That put me at 4 lbs SA and 8.25 to 8.5 DA pulls, with a smooth pull, nice break, and reliable ignition as the end result. All components and DVD are available through Midway/Brownells, just use their site searches.

Good Luck,
Mike