Rule of thumb, when you change something, don't get rid of all the old stuff right away! You may want to go back later, or have the original for if you sell the bike.

I realized the other day that almost all my bikes have drops. I have to have them because of shoulder injurys. And I am all over them, tops, hoods, drops, outside edge, and sometimes on the top curve with my wrists up. For climbing I will often use the drops more than the hoods. There is no way to figure % on what part for me.
+2 to raising the bar. My touring rig is an older quill stem bike, so somtimes I will raise and lower it depending on wind, terrain, and how the shoulder is feeling. lower for the mountains or when I need to get to the destination before sunset. Higher in flatter territory. In addition to the quill my stem is adjustable, so if I absolutely have to I can raise it up to Grant Peterson specs

Funny story, I was riding with some others that were going in the same direction, and at a rest stop I raised my stem because it was a rare tailwind day on really flat ground.
One of the other riders asked her husband(who apparently owned a bike shop and had not quite sneered at my bike)to do the same to her bike. She got really upset when he had to explain that her headset was to advanced to do that