There are lots of riders on this forum with a lot of experience, I am not one of them, but as a new rider this is what I am experiencing.
At surface street intersections, a right hand turn from the right lane into the right lane has a much smaller radius than does a left hand turn from the left lane into the left lane. I am a bit more tentative on the tighter right hand turns, but the left hand turns involve crossing lanes of oncoming traffic. In the empty parking-lot practice environment there is no significant difference between a right hander and a left hander, but on the streets the turns are a bit different in the details and require a somewhat different technique. The hesitation you are experiencing starting a left hand turn might simply be a result of an awareness that left hand turns are bit more dangerous. I also need to work a bit on my left hand intersection turns as I tend to initiate the turn a bit early which impacts how smoothly I can roll on the throttle as I exit the turn into the lane of traffic.
Bends in a road: twisties:
As a lot of roads have a crown to facilitate drainage, when turning right the slope of the road makes the turn a bit easier, but when turning left the slope of the road often makes the turn a bit off-camber and makes the turn slightly more difficult.
On long curves, sweepers, on the highway I do not slow at all nor do I follow an outside/inside/outside motorcycle line. Rather I maintain my lane position as I travel a smooth arc at a constant speed through the curve. The idea is to be predictable to other drivers on the highway without sudden changes in my speed or position. I don't notice any significant difference between left or right handed sweepers unless there is a crosswind or if I am passing a big truck.
I hope this discussion helps.
Writing about your experiences is a great idea and doing so should help you sort out what is going inside your skull. I also truly admire you determination to continue until you have mastered your skills. I think the most important factor in risk mitigation is attitude.