As you know I did some tests of my own.
First two images are frametimes and FPS during Kiowa autostart. You can clearly see where autostart is activated (15 s), and when the rotors start spinning (75 s).
Last two images compare Kiowa autostart with F18 autostart.
I have the same issue, and sadly the frametimes are so inconsistent that I can't use Kiowa right now.
5900X
RTX 3080
32 GB RAM
M.2 SSD
Quest 3
options.lua