Good speed for .177 JSB Monster Redesign?

What speed have you had success with the new monsters? Are the .177’s like the .22‘s where faster is better? Has anyone had issues with them spiraling? I want to tune my .177 Wildcat to shoot these, I currently have my Wildcat set to 130 bar (Huma reg) hammer adjusted to shoot them at about 897. (AVG 24 shots) my Wildcat seems like it wants to like them at 35 yards it’s grouping 3/8 of an inch. Nothing compared to the 10.34’s with pellet on pellet accuracy at the same distance. I apologize if this topic has been discussed before, maybe I just don’t know how to use the search system on here.