After continued investigation, this is what I have found and I am now up and running. So this save has roughly 11 hours on it and its my first save. I have fixed the issue, or rather it fixed itself, but here is what I did.
After loading with no mods did not solve the issue, I cleared my shader cache next. This still did not fix the issue, i would load in, rent a combine and header, go to the spot, still have the wild framerate drop, and the header would spaz out.
Following this, i pulled all mods completly out of my mods folder, cleared the shader cache again, and went back in 100% fresh. This time bingo I had no issues. This solved the problem. Im assuming that even though I was loading in with no mods selected, the game still having them in the background was possibly causing my issue? I do not know how that works I am absolutely an amature.
Since then, I have added back the core mods I use one at a time and tested the same spot the same way since, and so far so good. Currently I have not added all mods I had back, and will continue until i find the issue.
It appears I had a bad mod or mod conflict that had some type of lingering effect?
Every mod I am using is from the ingame modhub or itch/facebook direct links from the modders themselves so im trying to be smart haha.