was based on your saying you were going to move the c-clip to the .85" position from the "0" lowest position. The two aren't designed to work with one another. The 5100 is design to provide lift by compressing a OE rated spring and with the 884 the lift it provides is from its length and additional weight rating. When you take a coil like the 884, an compress it onto a 5100 you create a weak point at were the lower coil bracket, c-clip and c-clip groove over lap or say about 15 mm.
IMO the ideal solution is scraping the 5100s and using the 6112s with the optional B12 650lbs coils. this will yield around 2.5 to 3" of lift so youll gain the adjust ability you want to level the truck, the staggered settings compensate for the driver side lean.
Or use a complete OME or dobinson 3" lift kit and spacers
either way youll likely need UCAs.