Frame Skips on game builds

I am getting frame skips with standalone PC builds of my game, using the profiler when these skips happen I am getting spikes from rendering, I have tried Disabling objects in my scene which I thought may be the cause, I have tried suggestions found on other forums but with no luck, it is driving me insane and I'm about to do a Ron Swanson on my PC.

I have included a zip folder of Profiler data from 3 separate fix attempts

Profiler.data = standard build
ProfilerNoBG = Most renderers disabled
ProfilerB.data = level with static camera

Any help would be greatly appreciated