I used NIC panels zip tied in, and covered with a plastic floor liner cut to fit (for under desk chairs), and then outdoor/indoor carpet runner cut to fit for traction.
this is Peppy's cage. 3 x 3 x 2 with a 1x2 level. The level has cardboard and a sticky tile with a pillow case on top. I use a bed sheet on the floor for traction.
On the ramp, did you cut a strip of a runner?
Reason why I ask is because on my hunt for something with traction for my ramp, I found at Home Depot in the carpeting section, a roll of runner that looks just like that. I bought a couple feet, and trimmed it down for the ramp. I like the ridges to help bunny get up the ramp.