I loaded a bunch of 200gr lrn with 5.4(min) of sr4756. Tried them in both my XD .45 and champion operator. Both guns fired the roounds safely however they were too lite to cycle the slide. Now for the 1911 I ordered recoil springs in 9, 10 and 15lbs. Should it now cycle ok? What is the lightest handload you have used with reduced power springs?