Currently titanium concrete places regular concrete instead of a further improved variety of concrete.

I actually have a set of graphics that could be used to implement titanium concrete tiles (including a hazard variant) that I could donate for implementing that: https://imgur.com/a/4ad2Uus (There are also graphics for the edges and low res versions of each thing, but I didn't feel like uploading a crapton of images.)

I also have code that I'd previously used to implement the tiles in my own tweaking mod, but it'd have to be cleaned up a bit. Regardless, I'd propose a 60% movement bonus to maintain the pattern of adding +10% with each tier.