On the Super recoil spring, your load will tell you what spring to run, just watch your ejection distance, but keep in mind, the Super may send a case further than optimal. If you can keep your empty cases landing <10' away, this is spring you would want to run. I would limit the Super rounds to getting a POA/POI, checking for reliable feeding and function, and then using them for self defense only.
I suggest you try some +P .45 ACP, not a Super, but pretty darn stout and easier to tune your 97 for.
On the slide stop, I'm not that concerned with arresting the rearward travel of the slide since there is a generous abutement for the slide/frame stop area. So a recoil spring selection can be pretty forgiving. However, what stops the forward motion is the slide stop pin, which is no where near as generous, nor forgiving as the frame/slide. The slide is decelerated by stripping the next round from the mag, and is further decelerated as the round hits the feedramp, then transitions over the feedramp break-over. Lastly, as the barrel raises into the locking lug recess, the slide is slowed further. These "braking" forces reduce the impact on the slide stop. But when you select the incorrect recoil spring, you alter this relationship. A to heavy recoil spring will impart additional forces on the pin, increasing stress. The pin is a compromise between being hard enough to resist wear, but not so hard as to be brittle.
