Hey Capt'n! You seem to have a slightly better system then me. I have a Ryzen 5 5600X at 4.28GHz (which may help a bit, I think this game is big on single core clock speed) and a 3060ti card. I am running at the same resolution as you. I also render out to 100km and my settings are mostly in the 5 region. I actually don't have the foggiest idea what my frame rate is, I am mostly happy if I am not noticing anything that would make me suspect that it is low, which I rarely do. I do see some slight slowdown here and their with larger groups, but it mostly seems to be momentary. Reinhold Reinhardt (Reinhardt Reinhold?) got pretty far into 1918 and there was nothing that ground me to a halt. Are you noticing things running sluggish or is it just the numbers seem low for your system? I know I have the less flights but more likely to intersect with me options selected, which seem like a good compromise. Hope that helps! Cheers!
edit: also, my monitor is not running anywhere near 144Hz, but I am not sure what impact that has on frame rate...