1982 Virago 750 starting problem; not starter problem but carburetor problem

Recently restored my 82 Virago which has ~80,000 miles. Have been around states 3 times. Ever since new, to start cold I would only have to engage choke lever all the way and give no turns on the throttle grip. Started all the time with no trouble. If I did turn the handle it would flood out. Fast forward to today: Recently restored, new battery, new starter, great compression. My problem is that I can’t find the “sweet spot” on the choke lever. Sometimes it will start immediately…other times I will have to slowly move the chock lever while cranking and eventually it will fire. However sometimes it will not. I think I am flooding it so I have to wait. Cleaning the spark plugs and blowing out the cylinders has helped a couple of times, but there have been times when that doesn’t work. I just have to wait and eventually it will crank,,,sometimes immediately; others times a struggle. The back cylinder seems to be firing better than the front since it doesn’t have the carbon buildup the front plug has. Do you think it is because the carbs are not synced correctly or the firing is not hot enough. It runs very smoothly when it does crank, however I must find the running “Sweet spot” on the choke lever. It needs to be open about 1/2 way instead of closing the choke lever complete. However it runs so smoothly. When I stop sometimes it cranks immediately…other times it is a hit and miss. Thanks so much for your future comments.