It sounds like you are trying to fix a problem when you don't know if there is actually a problem.
Before making modifications to improve the accuracy, go shoot the gun and determine if it actually needs anything done to it or not.
Slugging bores and doing the things you are discussing is what you do AFTER you have discovered that the gun does not shoot well. ^^^This^^^
"Allways speak the truth and you will never have to remember what you said before..." Sam Houston
Texans, "We say Grace, We Say Mam, If You Don't Like it, We Don't Give a Damn!"
~Molɔ̀ːn Labé Skýla~
| 
