Best GS Settings for GT3 and 4?

[THERAZORKILLE]

I've been playing GT3 and 4 with this emu and have noticed that when in a race, my car's wheels look blocky.  This is an issue with both GT3 and 4.  In GT4 on sunset and night tracks, light sources flicker and can be seen through walls and other cars.

My current GS settings with one of the latest GIT builds are:

Adapter: Nvidia GeForce GTX 780 Ti
Renderer: OpenGL (Hardware)
Interlacing: Auto
Internal Resolution: 3x Native
Shade Boost enabled
Allow 8-bit textures checked
Texture Filtering: Bilinear (PS2)
CRC Hack Level: Partial
HW Hacks disabled
Hardware Depth and Accurate Date both checked
Blending Unit Accuracy: Medium

If I use D3D11 as the renderer, then the image looks very dark and the glitchy light sources also become a problem in GT3.  Regardless of what renderer I use, I get a major slowdown when entering the main straight of SSR5 even at 2x Native.

Anyone know how to at least fix the blocky wheels?

[jesalvein]

In order to help you further with your problem, please make sure the following are all provided.

• Your hardware specs - CPU, Graphics Card, Memory, Operating System.
  
• The version of PCSX2 you are using.
  
• Any non default settings you are using.
  
• What games you are trying to play and if you are playing them from ISO or DVD.
  

Thank You.

[THERAZORKILLE]

In order to help you further with your problem, please make sure the following are all provided.

• Your hardware specs - CPU, Graphics Card, Memory, Operating System.
  
• The version of PCSX2 you are using.
  
• Any non default settings you are using.
  
• What games you are trying to play and if you are playing them from ISO or DVD.
  

Thank You.

Version: 
PCSX2 1.3.1-20151029190949 (git)

Non-Default Settings: 
EE Round and Clamping set to Chop/Zero and Full
VU Round and Clamping set to Chop/Zero and Extra + Preserve Sign
MTVU Hack enabled

GS Settings:
Adapter: NVIDIA GeForce GTX 780 Ti
Renderer: OpenGL (Hardware)
Interlacing (F5): Bob tff
Allow 8-bit textures: on
Internal resolution: 3x native
Texture filtering: Bilinear (PS2)
CRC Hack Level: Partial (OpenGL Recommended)
Enable HW Hacks: no
Hardware Depth: yes
Accurate Date: yes
Blending Unit Accuracy: Medium

PC Specs:
CPU: Intel Core i7 4790K
RAM: 32 GB 1600 MHz
GPU: Nvidia GeForce GTX 780 Ti
Primary disk drive: Samsung 840 Evo 250 GB
Secondary disk drive (ISOs are being loaded from this one): Western Digital Caviar Blue 1TB

I'm trying to play Gran Turismo 3 and Gran Turismo 4. Gran Turismo 3 works almost 100% unless I use high blending unit accuracy, which causes the framerate to drop to 10 in home, prize car screen, arcade car select, and dealer (when a car shows up in any of these screens).
This same problem happens in Gran Turismo 4, and light sources flicker and can be seen through cars and walls. In both games, the wheels appear blocky on the car that's in focus.