Problem painting / blending UV seams using 3d paint tool in CS4

I am having a tough time blending seams on 3d objects in CS4. I create textures for 3d figures used in Poser, and Photoshop is my preferred 2d painting tool. Sometime ago, I bought CS4 pro thinking that the 3d paint feature would enhance my workflow when developing textures. Unfortunately, I find the capabilities of CS4 to be somewhat rudimentary at best, so I am stuck using Deep Paint 3 to do blending. For example, when I try to paint over a UV seam with 3d paint on a wavefront .obj model the seam will not take paint. When I paint over the seam, a stripe is left several pixels wide - whats up with this? Do I really need to go back to the2d texture map to blend my seams/edges? This seems somewhat useless as I originally bought CS4 to improve my workflow for blending edges and maps together. Is there a workaround that will allow the paint to actually be applied to cover the edges / seams, and preferably a number of pixels beyond?
Another thing I noticed is that the blur/sharpen/smudge brushes do not work to blend edges either, in fact, when I try to smudge across an edge, I just contaminate image with stuff beyond the edge from the texture map. - if the pixel just beyond the edge is black, smudging just drags some black into my image. Is this really how this is supposed to work? Even using a normal brush seems to cause contamination too.
Has anyone found a setting or workaround to fix this? Is the new CS any better?
below is a simple example of the painting problem on a simple cylinder I loaded. The original texture map I was painting on was gray.. to demo the problem, I flooded with red, which left a gray line at the seam. then went to a green paint and and did a couple of strokes with a brush. You can see that even simple brush strokes dragged some gray into my image. Am I missing something, or is this as useless as it looks?

Yes, it's just the way it is. You probably have wasted your money and should have bought ZBrush or modo or Cinema 4D...
Mylenium

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Copy and paste only this area, you may have to scroll down.
Adobe Photoshop Version: 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00) x64
Operating System: Windows 7 64-bit
Version: 6.1 Service Pack 1
System architecture: Intel CPU Family:6, Model:10, Stepping:9 with MMX, SSE Integer, SSE FP, SSE2, SSE3, SSE4.1, SSE4.2, HyperThreading
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Logical processor count: 4
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Built-in memory: 6019 MB
Free memory: 3360 MB
Memory available to Photoshop: 5227 MB
Memory used by Photoshop: 60 %
Image tile size: 128K
Image cache levels: 4
OpenGL Drawing: Enabled.
OpenGL Drawing Mode: Advanced
OpenGL Allow Normal Mode: True.
OpenGL Allow Advanced Mode: True.
OpenGL Allow Old GPUs: Not Detected.
OpenCL Version: 1.2
OpenGL Version: 2.1
Video Rect Texture Size: 16384
OpenGL Memory: 2112 MB
Video Card Vendor: Intel
Video Card Renderer: Intel(R) HD Graphics 4000
Display: 1
Display Bounds: top=0, left=0, bottom=768, right=1366
Video Card Number: 1
Video Card: Intel(R) HD Graphics 4000
Driver Version: 10.18.10.3958
Driver Date: 20140930000000.000000-000
Video Card Driver: igdumdim64.dll,igd10iumd64.dll,igd10iumd64.dll,igdumdim32,igd10iumd32,igd10iumd32
Video Mode: 1366 x 768 x 4294967296 colors
Video Card Caption: Intel(R) HD Graphics 4000
Video Card Memory: 2112 MB

Problem painting / blending UV seams using 3d paint tool in CS4

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