**Disclaimer: I apologize to all the Tomshardware haters out there. I don't like them either, but they've got the info I need for this one.
@Mike: I'm not sure what "..kind of plays like it used to. I'm not sure but I think I'm satisfied with it's performance" means, but considering your 6750M is roughly
equivalent to the 6670 in this Benchmark,
you should be able to run LoL maxed out on your laptop. If you cannot, I suspect there is still something fishy going on in there.
1) Make sure you have the latest driver for your GPU
2) It's probably better to watch clock speeds on your CPU and GPU than to watch temps. Laptops always run hot (not 92C, but hotter than desktops). Your 6750M should run at 600MHz / 900MHz Core and Memory respectively.
GPUz should be able to log this for you. AFAIK, throttling temp is a fixed value to protect the chip from damage. Even if you could, you wouldn't want to change it.
3) The best way I know of to test CPU temps/clocks is to run Prime95 with CPUz open (HWMonitor for temps). Make sure you're getting 2.2GHz with all cores and around 3GHz using only 1 core(thread). I recently had a friend whose Asus laptop power options were all messed up to the point where the CPU could never go over 33% of the base clock speed (700MHz saves a lot of power and heat, but it's not great for productivity). I had to uninstall the Asus bloatware power profiles to get the thing to return to default clocks. Simply selecting the Windows "Balanced" profile didn't override the Asus setting.
i5-3570K, ASRock Z77 Pro4-m, Asus GTX660 TOP, 120 GB Vertex 3 Max IOPS, 2 TB Samsung EcoGreen F4, 8GB G-Skill @1.25V, Silverstone PS07B