Bell 407 weird jerkiness

I have an issue that only seems to happen with the Bell 407. It frequently gets very jerky and stuttering with frame rates to a noticeable degree. Sometimes pausing for about a quarter of a second between frames every so often. No other aircraft does this at all. The Guimbal performs fine. I tested flying across the same scenery first with the Bell, then with the same route using the Icon A5 which was able to go at the same speed and altitude. There was a big difference. It doesn’t seem to make a difference whether I am in exterior or cockpit view.
Has anyone else encountered this? I don’t have a particularly high end system but I don’t get any frame rate issues with any other aircraft at all, my settings are fairly modest. This is NOT the actual helicopter jerking around before anyone suggests it’s my piloting.