I have a 2002 Accord with the 2.3 auto, Ex leather myself. 155k, no trans problems as of yet, knock on wood! I knew that was not a 78 GM OD as I had one of them way back when, and I know it was not a Merc either! Enjoy!
Have you tried Valvoline Maxlife synthetic transmission fluid? I had issues with my 2003 Acura TL Type-S, Flare up, 1st to 2nd, 2nd to 3rd when cold, and some shuddering. Did a 3+3 drain and fill, fixed it right up. drives and shifts great, cold, hot. I still have it, 238k miles.