you can improve your caster by lowering the pinion angle (and pulling the upper ball joint back in the process). But that may introduce drive shaft fitment issues.
Do you have a magnetic degree gauge?

Keep a close eye on you upper ball joint in relation to the lower. Don't let the upper get verticle or in front of the lower one. 4 to 10 degrees behind is preferred.

When you lower that pinion and subsequently increase caster, you will have a more stable front, but you may face front drive shaft angle issues.

My Cherokee D44 is ideal in caster with the pinion angle pretty much parallel to the ground (as was stock installation). Handles well and is about 8 to 10* caster (stock), but I have the pinion angled up with only about 2* caster; Incorrect technically for drive shaft angle and unstable, but I needed it for the front shaft fitment. My front drive is limited in usage and at very low speed.

cutting Knuckles and moving them and rewelding is the perfect way to do it, but most people don't have the required Jigs to maintain alignment when welding. Takes a very good experienced welder to anticipate how the weld will contract the joint as it cools, and as it contracts change the angle of fitment in welded parts.