I wouldn't quite say that they're treating Ryu like they treated Keisuke later on in Kiva. What was taken away from Ryu was his desire for revenge and the hatred that plagued him, but not necessarilly his composure. I'm saying this without any bias, so as to be fair. I mean, the Gene arc showed that he can both swallow his pride, but he does hve a limit of embarassment, ending the arc with a rather desperate attempt to get back his slightly stained reputation after running away.
Ac for Accel Trial, I think the point behind hte SFX for him ws to show how fast he was, and how he's gained the speed to land an extreme number of hits while not being hit himself, and it does show, esepcially in his debut fight where he moves so fast that he's a near-total blur, while the Weather Dopant was still completely clear to see. Another thing I think was attempted was showing how he hits so fast that his opponents can't do anything about it, as shown in both the Weather and Hopper fights. I'm glad that this is a deaprture from past speed boosts
This is all just my opinion, with as little bias as I can have