Hey slim, forget the literature. Go with 72/19 on the gearing. Temps on the motor should not break 140. Temps on the speedo should stay under 130. This is if you want to prolong the life of your gear. I run this on my brushless motor:
This brings the motor temp down, which lets you gear more aggressively. And for the record, when you ask for advice, even if you dont agree with it, dont shoot someone down on the forum. That person may have something for you later they will keep it to themselves when you really need it.
The manual gives you temps that will cause damage if you run at those levels for extended times. Keep it under those temps, and your motor and speedo will last.