Just keep an eye on the stick and make sure it isn’t slowing down during the exchanges.
My HS 4×1 went 43.1 with me at an 11.1fat and the rest at 11.5+fat. If everyone is that fast in the open 100 and it hasn’t cracked into the 42’s yet then I would think there is slowdown during the exchanges.
Stride frequency increases as ground forces increase and I’ve never found it beneficial to actively try to increase it. The only exception is if someone is clearly overstriding and they are landing in front of their COM, then cuing them to cycle through faster, in my experience, will tighten up their mechanics and bring them closer to striking under the body.