I don't normally change springs on functioning firearms any more because I can't remember a firearm I've owned with functioning or ignition issues where the cause wasn't directly attributed to springs in one way or another. As soon as the gun was restored to stock form or the original springs were replaced with new springs the issues were resolved.
I only have one gun left in my safe that doesn't have stock springs and it's also the only one finicky about primers. Its a short stroked and tuned 1873 rifle I use for CAS. I got it figured out but I had to switch primers and crank up the tension on the hammer spring to make it work. If I had a do-over I wouldn't have had the tuning done because besides the ignition issues I don't think it made one whit of difference to my speed. The action is very slick, the stroke is about 1/2" shorter and my wallet is thinner but that's about all that came out of it. If it ain't broke don't fix it.
Iowegan, I'm sure you're tired of hearing it but, once again, great info.