[Toddzaracki]

I have a 1990 yj 4.2l ax15 with a 4 inch rough country lift and a Tcase drop on it. I want to get a bit more lift out of if but I'm not sure how much shackle lifts affect steering and driveline angles .. What shackle lifts are good ? And if I ordered a slip yoke eliminator would I calculate the shackle lift with my suspension lift for driveshaft ?
Thanks in advance for your help