On your forks, the stock amounts are ok but they work better with a bit more oil.
With the springs out forks collapsed, fill to 6 inches down from the top. I use a piece of clear tubing with a zip tie around it 6 inches from one end. I put in about 8 ounces of oil. I put the 6 inch end of the hose down into the fork so the zip tie is at the top.
I then use my Miti Vac to draw out any oil above 6 inches down.
At the cost of oil, try a few different oils.
In the book, they used several oils, early forks used 30w engine oil, later they speced 10w30 engine oil. Later they speced 10w oil.
I have tried A 5w20 motor oil, a 10w30 motor oil as well as ATF. I like the atf the best so far. I may try some others.
The extra oil decreases the amount of air above the oil. This increases the air shock effect of the fork. This reduces fork dive while braking.
The oil flows through holes in the damper rod. Changing the weight of the oil effects how fast the oil can flow through the damper rod. Thinner oil flows faster, quickening the responce to bumps. A thicker oil slows the flow and slows the responce.
Try a few to find what you like the feel of.
Leo