I'm not certain what the drop rate SHOULD be. However, drop rate applied only to the difficulty of getting an item not the difficulty of the game. In fact, drop rate required no skill. Only luck. HOWEVER, that changed somewhat with Abyssea. Now, skill does affect drop rate.

Bottom line is that I don't know if the drop rate should be raised, lowered, or left alone. But, from the experience of going 1/43 on P. Harpe, I felt no sense of accomplishment when I finally got a very difficult to get item. In fact, I felt somewhat bitter, tired, and unkind towards the game and S/E in general. By the time I did get the dagger, I had given away 7 Kotes as bribes for assistance, although I needed one for my Monk, and untold BST hats had dropped to the ground. I spent at least an hour everyday begging people to come camp it with me. Many days, I had to get up in the middle of the night, alter my work schedule, or just plain miss sleeping. This is not my idea of a hard-core gamer. It's the profile of an idiot. I will never be that stupid again. (p.s. - Had a friend who tied my record with 1/43 on Trotters, so it's not an isolated experience)

So, to the OP, just realize that when you suggest making stuff harder, and especially when you throw in drop rates, there will be a lot of people who immediately take exception with your suggestions.