You said it rockets up to 6200rpm? That sounds like the upper bracket that the system is allowed to set it to, however that is far above that any third party application can interface to tell it to go to. I have a late 2008 MBP and the range that is allowed to be suggested to the system is between 2000 and 6000 rpm. However if the system deems it necessary, it can push it up to 6200 rpms. If you try to set it to this or higher through a third party app the system will only recognize the high end of the bracket, for me that is the 6000 rpms. What you are describing sounds like a problem with the SMC itself. Please do try reseting the SMC, and the PRAM and see if that changes anything for you. Do also check for any firmware updates for your mac.
I am still not going to change my stance on this as it is a fact that using the GPU and CPU causes more heat to be generated. This isn't an over-time thing, as soon as you start putting demand on the graphics card and the CPU, and the more powerful each are then the more heat they are going to generate. The fact that you don't see a significant increase in heat should go to show you that you have a mac that is operating properly and is preventing itself from getting too hot. You want it to get hot, then it is still going to run the fans on high to cool down. I can only assume you are trying to reach some middle-ground here on fan noise to heat ratio. I have more faith in the apple engineering team than you do in deeming how the hardware should operate. If it is that much of a bother then I would suggest buying yourself some studio headphones or a surround sound system to play the game with.
I get what you're saying, and I appreciate your attention and your help [no sarcasm], but I've dropped even the resolution down to bottom (not even sure if that would do anything). And I play with everything turned off and low fx enabled (with the exception being earlier, when I was following this post that claimed high shadow/high fps cap fixed gameplay issues.
But the thing is, I'm able to run other games from this era, and with higher settings (including 1.02 D3). It just... doesn't... make sense >.<
And please know that my frustration comes from the fact that I truly do enjoy this game and have invested a lot of time into it. I am fighting with everything I can not to be forced back to Diablo 2 until 2015 when I could get a new comp or a new upgrade piece sooner.
Anyways, looks like this thread is all opinions/no-ideas now with no Blue post follow up to be found. At least I was responded to though, which I appreciate. Thanks everyone.
Edit: I was finally able to get the RPMs to drop a TINY bit though it happened randomly and I couldn't pin it on which of the steps I in order to pursue further. It was not enough to pass that "one-level-down" noise threshold though :-/ and that's all I needed.