http://psxdatacenter.com/ is the best place to look for settings per game
http://psxdatacenter.com/games/P/T/SCES-00255.html just past the screen grabs are some emulation notes
You should get some external graphics plugins recommend any of pete's http://www.pbernert.com/html/gpu.htm
Or you can make the jump from ePSXe to Retroarch instead