Thank you for your reply,
I did consider the fact that it might be because of all the extra items, interiors and modifications but the part I found strange is that my GPU was at around 15-20% usage and my CPU was at around 50% and RAM around 70% so it didn't seem like any of my hardware was causing a bottleneck.
I've managed to fix it in a way by putting all settings on low and just using MSAA to force the GPU to take on more of the load (it'll stay around 90-95%) and give me 58-61fps in Legion but it seems that it'll be smooth in the city but then when I go up North it will dip under a certain threshold and dip my GPU use again to 15-20% with an FPS of around 35-40. It feels like the GPU isn't receiving enough load until I ramp up some settings to make it use more of it's power but then of course one setting that works in a populated area will then be ineffective in a more remote area.
GPU: NVIDIA GeForce GTX 1050 Ti (4gb)
Processor - AMD Ryzen 7 1700 Eight-Core Processor 3.00 GHz
Installed RAM - 16.0 GB (DDR3 I think)
I play at 1920x1080 - 60Hz
These are my current settings but I am constantly tweaking them so I wouldn't class these as "accurate":
Thanks again for taking the time to help me with this.
It is very much appreciated