YOu mean the front crank opening where the bearing is located? If so I'd say your front bearing has gone bad.. It's not sealing any more.. Idealy there should be NO or VERY little oil coming from there.. When I say very little I mean hardly noticable.. I don't know about the carb issues though!

Is it mounted upright or inverted.. What do you mean low idle could be better? Is it loading up on you then sputtering when you try to go Full throttle.. or is it just slowly revving up?

I don't believe I've ever had one shoot out oil from the carb!

What fuel/prop are you running?