I had two cholesterol tests taken during the first 6 months eating LCHF (< 30 net carbs). My LDL-C was 141 a month into this WOE and 129 at the 6 month mark. My average weight loss was 15 pounds per month during that period. I was also still quite insulin resistant. My BG didn't normalize until I was eating LCHF for nearly a year. It was the next cholesterol test -- 13 months into the diet - that my LDL jumped to 250. So near as I can tell, the jump in LDL happened at a time when my insulin resistance was resolved. Other confounding factors: I'd also dialed down the carbs to < 20 net and started experimenting with intermittent fasting. So who knows for sure.

When I was neck deep trying to figure this LDL craziness out, I ran across a Dr. Sara Hallberg video where she postulated that the high LDL phenomenon with some low carb individuals might have something to do with regaining insulin sensitivity. So I would suspect that my experiences are not unique.