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I have never lightened a leaf mainspring by slotting it, I always just trim some off each side. Those guns have a pretty heavy mainspring but I would try to live with it rather than try to fix the "problem." (The mainspring works like that in the old Colt DA's; it is a "V" spring with one limb powering the hammer and the other powering the rebound lever and trigger return.)
Is the gun one that had the cylinder cut at the back to take .45 ACP with half moon clips? If so, you can only use .45 ACP or .45 Auto Rim; .455 is no longer an option.
You are wise to reload with light loads if using .45 ACP or Auto Rim. Using .45 ACP has resulted in burst cylinders on those old guns, as the pressure is quite a bit higher than the gun was made for.
Jim
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