I think I realize the problem I had before. I couldn't put words to it, but I slept on it, and realized that 1d4 is half of 1d8. The average of 1d4 might only be a couple points lower than the d8 (2-3 vs 4-5), but a d4 will never reach 5-8, and that is why it is obviously worse. Man, I must have been out of it last night.