K98 verticle stringing?

Ok so I had little time to do more testing so it was right to xtc cmp shoot 100 yd reduced.
I obtained some yugo m75 ammunition. I spent my sighters and 5 shots for score trying to adjust for windage. I got it pretty close considering I was on my belly and under the clock.
So it has changed for the good. Let me start by saying trying to do any kind of holder over with these sights and my eyes was a waste of time for me. So even though windage was still a bit off to the right I kept my regular hold of 6oc. I'm having camera issues so no pics at this time. Prone slow fire was a decent group but off to the right in the outer 9/8 ringarea. Plus I lost 5 shots drifting the front sight. I still managed a 128 which for the first time shooting this rifle and left handed is very good considering how poorly this rifle shot in the beginning.
prone sf 128
prone rf 72
sitting rf 70
standing 90
The time I got to standing I was getting used to the sights and the gun. Thanks to all with the tips.
As mentioned there where no "one" thing that helped the most.
I just went through it. Section by section. Little by little.