Even my Walther PPK/S has an 18lb, and I have a 22lb still in the bag...
My S&W 1911 Match is full size and was tweaked, when I was single and had money. It has a Wolff 18.5lb spring, and has yet to let me down with any ammo, even the notorious weak Wolf target ammo.
Although with a good polished feed ramp, I can agree with TAB, on a lighter spring. If it eats everything and is broken in, a lighter spring, but yet not too light, should work, but for a full size 1911 I prefer a slightly heavier spring due to length of slide.