I don't know your goals, but I assume speed. At ~20 mph power and comfort are likely going to make you go faster than aero. Aero matters, just not that much at that speed.
The balance should be more toward comfort and power rather than aero if speed is the goal.
There are still little things to get more aero.

As in the post above get forearms parallel to the ground and pointing into the wind. With a lot of power, that can be done with bars really low. But if your bars being low mean you have to have straight arms with your forearm length in the wind - your bars are too low (for your power at 20 mph). Don't copy pro position unless you have pro power. Some things are fine to copy, being low and flat is not one of them.

Clothing should be obvious. Watch you elbows sticking out and your arms crossing. You can roll your shoulders in a bit. Shaved legs (and arms) are more aero, but you can save that for higher speeds.