Maybe you are doing something wrong...the quick explanation will be
1.Open the epsxe card with MemcardRex=>right click on the save=>choose Export=>from Save as Type,choose RAW and save
2.Open PS2 Save Builder=>Click on the first button=>drag drop the file that you exported into PS2 Save Builder and replace the "NEW_FILE" in Root/ID with the exported file name
3.File=>Save as=>on Save as type choose *.max and save
4.Open mymc and your memory card and import the .max save
Is that something you would be willing to do again? I put 40 hours into my Suikoden 2 game, beat it this morning, and was really looking forward to playing Suikoden 3, but I can't transfer my file over.