I have decide to replace my factory rods with Wolff stainless rods and springs. The factory weight springs for my 20,21,29 and 35 are 17 lbs from what I am told. Has anyone had any problems with using a heavier 19 pound spring with moderate to warm factory loads? I also have a 27 that I would like to bump up to a 18 lbs spring, again using factory loads and sometimes using a 357sig barrel. Thanks for the input.