I'm having a blast with the PC version right now (I've rung the first bell, and all melts before my +10 Zweihander), but I wonder, why didn't Namco/FROM ever patch the game to include DSfix-like features?
It was a colossal pain in the ass applying DSfix since only one person here bothered to speak in laymen's terms when I asked what the #s in the .ini file meant, etc. You open that file and it's just a jumble of nonsense when you don't know how hacking works.
Morten242's UI for DSfix is a neat application that streamlines the process -- you basically get a window where you can set the resolution, add anti-aliasing, etc -- but thankfully at least one person on GAF explained how the .ini works.
Also, OP, remember to toggle off anti-aliasing in the game options. You can pump it up in the .ini (I.E. SMAA x8), but it you have to turn the option in the actual in-game menu to Off. Otherwise there will be strange glitches.
At any rate, Namco/FROM should update the hell out of the PC port.