That is the way it has always been, the higher the skill level the longer it takes to teach them. It will be at the rate of .01 when you hit 19 or 20, I can't remember exactly where.
Skilling logic with the War Game is more than twice as fast as teaching on the last 2 points. You gain .02 per 3 clicks (takes prob about as long as teaching a lesson) and you do not have to green fun and energy until you green everything. LOL The loser might pass out if you do not serenade them before they click off of the table.