When you place your hands over your keyboard to type... where are your fingers? All straight in a row.
Your longer middle finger is actually more comfortable being a bit bent and retracted (relaxed)... and its position actually is more advantageous to faster presses in this way.
In the heat of battle... you will acidentally press the edge of the middle finger button on accident, because your brain thinks it should be in a row lined up with the others.
Good to hear your progress and joys Will : )
Give cosmic chasm, star trek, supersprint, turbo, Tac Scan, Tron, Discs of Tron, Major Havoc, Pole Postion, - with your new spinner : )
Ohh, and if you like Robotron... try Rescue.