There is NO "normal" needle settings for any engine. The thought is an absolute farce. The needles on the 110 have an effect on each other, causing varied settings. Typically the low needle will be more closed than the high. Cylinder temp spreads of 25 to 60 degrees are not uncommon on twins. Temps in the air are rarely the same as temps on the ground. A person can easily create a much greater temp spread that actually exists simply by aiming a temp gun a degree or two differently than they did on the other side.

It's very difficult to determine what's going on with your engine via a printed media. What you call rich may not be rich at all. Is it rich in level flight or on an upline? Does it peak on an upline or sag? Does it peak in level flight on on a downline? All of those factors help in making a rich or lean determination. If it's a little rich on the horizontal and peaks without sag on an extended vertical upline then it's where it needs to be. It should not be reaching peak rpm on a horizontal line.