Could even larger jumps than 8kg be made with the right program order?
If one attacks the program with vigor and discipline, yes!! I have been training with kettlebells for over 15 years and have made some significant improvements because I kept showing up. Showing up and executing your program with heart will move you a lot farther along than anything else. You will often read, because it is true, a so/so program executed with heart and vigor will
soundly outperform the perfect program done halfheartedly.
That said, pick a program and stick with it. Just show up, day after day, after day, after day, after day, after day...that time
is going to pass regardless, you might as well put that time to good use.
Don't worry about hitting or missing a kg goal. Yes, it's good to shoot for something but don't let a narrow focus on a number blind you from seeing other improvements.
Also, most importantly, find an SFG in your area and get a few sessions. There is
NO substitute for knowledgeable feedback from a trained professional who knows what he/she is looking at and looking for.
Period.