The 881/883 seem to give more around 2" maybe 2.5" at the end of the day, without adjusting what notch on the 5100s. If the 890s are new, they will settle a bit over time. I run 881/890 currently and this is my stance with 100-150lbs of gear in my rear storage. OME shocks and 265s.
I have not needed to adjust my bump stops at all and have done quite a bit of technical wheeling with this setup. I do have a pair of LC coils I plan to toss in with a longer shock here soon and from my research, bumps tops / extensions are typically needed with that setup. You can always cycle your suspension to really nail down where you want your bumps.