I'm having a similar issue with tungsten steel plates. If I check Leonie's inventory, a 145 quality steel plates will have a 146 mechanics requirement, about 100% progression, but a 131 quality tungsten steel plates will have 141 mechanics requirement, which is 107%. I haven't seen anything go higher than the patch notes' advertised 112% cap, but I'd like some transparency on which items progress faster and why. TiChrome Plates for example seem to have a progression slightly harsher than steel but easier than tungsten. I guess they all end up capping at 112% for endgame anyway, but it's hard to plan around your crafting for middle game