With a conversion, it's difficult to say without riding your bike. But, considering it came out f a bike shop, I have to at least consider the fact it's set up correctly.
The neat thing about the conversion is; whatever you do, you can always put back if it isn't right. Try it and see if it makes a difference.
My gut instinct is, you just need more practice. I think I was probably two weeks of playing before I felt comfortable enough to venture out into traffic.
Mark
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Bicycling is my drug of choice. Followed closely by beer.