I'd install the icons and see if you are still 3/4" low. It could be your factory leafs out of spec. If you are still too low look into lift blocks that bolt into the leaf pack via the center pin. 1/2" blocks are common on Toyotas. You could make one out of 3/4" bar stock and buy a new longer...
Its pretty straightforward. If you're mechanically inclined it's an easy install. I'd recommend 2 floor jacks one under the bottom of the diff and one under the pinion flange once you have the factory leafs removed. That will make it easy for you to tilt the axle so the pins on the new springs...
I have them. Got about 1.5" of lift without the add a leaves.more info in post 29 of this thread
https://www.ranger5g.com/forum/threads/new-icon-rear-leaf-pack.11928/page-2
Just installed these yesterday without the add a leaf on my 2020 FX4. I already have Bilstein 5100's front and rear so can't compare it to stock. The coil overs are @ the 1.8" setting with the addition of a 1/4" spacer which gave me almost 3" of lift in the front and the truck was completely...
They are 2 completely different measurements. You can calculate one from the other. For offset to backspace you need the rim width divided by 2 +or- the offset + the width of the wheel lip
Example an 8" wide wheel with +25.4mm offset(+1"offset) wheel lip of 12.7mm(.5" lip width)
8/2=4 4+1=5...