Quote: "But its mostly down to level design and a poor comp that causes poor fps."
While there have been some improvements to the engine via the upgrades FPSC is far from optimized and there are still some serious issues to do with the engine and the way it works that have nothing to do with the pc or graphics card you are using (although that may have a factor in it as well).
Until the engine is optimized and some of the kinks are worked out what you have is what you have...with an FPSC upgrade you can get speed improvements but that's no guarentee.
I due agree that that the level design can have an effect on framerate.Once again this is due to the way the FPSC engine runs as well.
I am sure that Lee and the rest of those at TGC are well aware of these issues and will strive to work on them at the earliest opportunity.
Please have mercy and use the search function.