Dang. Thought of another aspect of FPS in my first post here. As it is - frames per second. Most LCD monitors can show no more than 60 or 75. Regardless of the video card, CPU etc.
I go with 60 FPS. I have no mouse lag. Game runs smoothly, no delays, no jumping.
There must be a way to fix it without forcing FPS over 60.
Cus, really, now i understand where it comes from. From my point some ships seemed to be moving somewhat.. angularly, light fighterish. Almost same feeling as when i'm trying to hit a strafing Liberator, or vanilla Sabre. Perhaps, just some frames went past my client.