The current CRT I'm making doesn't include the speed downgrades (that's for 2 years from now if I'm still here, or if someone else makes it).
It's mostly about revising the contents of the profiles, like Names, Summary, Range, revising justifications for AP, Speed, Dura, and adding Weaknesses, Intelligence explanations, Notable Attacks, and Equipments. Razul gets some additions in his powers/abilities too.
It's pretty long because it involves almost all of the LN characters. Plus I'm busy with college so this will probably take a while.
For one, everyone with MHS speed will probably get downgraded, though I'm not sure where to put it. There are statements where even Velgrynd going at Mach 1000 was considered impressive, if I'm not mistaken. Karion was moving at several hundred times the speed of sound and was giving Benimaru trouble (note that both of them are Awakened Demon Lords at this point). Kondou's bullets were also only at Mach 1000 range if I'm not wrong, only his Judgment Bullet was traveling at Rel+, which means even the Clowns are below Mach 1000 since they fought Kondou.
Rimuru and the others may also lose their Relativistic combat speed, instead that's only going to be reaction/perception speed with attacks like Disintegration remaining at Rel+. When you think about it, this doesn't necessarily contradict even their current feats (due to characters having Precog, and reading the opponent's movements so they don't have to be as fast as the attacks themselves).
Even Volume 18 has confusing speed feats. Leon was definitely described to attack at Rel+, but the key word here is attack, so it could be interpreted as only attack speed. Silvia was keeping up with Leon because she can fight at the speed of lightning.
Though I would like it if all the speed feats are compiled so that we'll be able to weigh in which is consistent and inconsistent, potential outliers, etc. But there's little to no chance that those unimpressive speed feats are mistranslations so, we just have to accept it. I'd still be salty about it though.