Agreed. Plus, "let off the gas" makes me think you are just letting the throttle go. Smooth on, smooth off. Kind of like the karate kid. If you just let go of the throttle you are going to decelerate quickly on any bike. Roll it on, and roll it off. "Coasting in gear" is not something you really do on a motorcycle like you would in a car. Once you get used to the relationship between shifting gear, feathering your clutch, and utilizing the clutch and throttle together, I think some of the problem will take care of itself.
Also, the shaking could very well be because you are lugging the bike. I have been riding for a while and I just got back from doing about an hour of practice in a parking lot. Just finding the right balances. It is not something that comes naturally to most people. You will ride as well as you prepare to ride. Since you are a new rider I would check out "Proficient Motorcycling" by Hough. Truly worth three times the price of the book.
"In a car you're always in a compartment, and because you're used to it you don't realize that through that car window everything you see is just more TV." R. Pirsig
Soon, we ride.
AKA JD Mader or you can call me "Dan" just not early for dinner.
Click my handle for a link to my homepage/blog...which has nothing to do with MCs. Free literature and music! Viva La Revolucion!
2008 KLR 650
RIP DM - Soon, we ride.