Always good to air towards the rich side.
Here's a couple good reference for carb specs and tuning
http://www.seadoosource.com/carbreference.htmlhttp://www.seadoosource.com/carbadjust.html
Not sure about the temp of that specific area. A quick way to make sure everything is running correctly is to grab the spark plugs after riding. If it's too hot to hold it's likely lean. You want to be able to hold the plug and feel the heat but not need to move your hand away because it's too hot.
There's a thread on this forum that tells all about reading the color of the plugs. This is the most reliable way to know your tune is on point. On a quick search I couldn't find it but I'm sure someone will chime in.
Another way to get an idea of how your carb tune is are by the way the ski acts when accelerating.
If you pull the throttle dose it sputter? or does it try to die? Sputting is rich. dying is lean.
its always good to remember that if the carb is too lean it's going to run better than it ever has before and about then the top end is going to go.
As I live at high altitudes the stock carb settings always put me a little lean. On my first ski I richened it up to the point that it sputtered then slowly brought it back down. Always planning to keep it rich for safety. After that ski I realized I can generally go about an eighth turn out further then stock setting.
however at sea level the stocks settings will be more or less right on the money as long as you properly set the carb including the pop-off.
the more you ride it the more you will get to know how it feels and will be able to tell when things are off. It's nerve wracking when it's your first ski and you have put money into, but don't over stress. Just do a little more research and soon you won't be worried anymore.