I start 2up riding fairly soon after riding. I’d taken the course and ridden a season.
I ride an older 750 shadow.
My son rides with me he’s a big kid 180lb, I’m a heavy guy, lets just say I’m a little over that.
I find my best advice is, ride like it’s your grandma on the back, do the turns very upright. The bike is a LOT more unstable at slow speeds. Then slowly as you quit bonking heads, start leaning more and more into the corners. I prefer to have my passenger neutral on the back of the bike, not leaning with me, not fighting the corner, just only leaning as much as the bike. To me it’s like the bike that weighs 180lbs more. Which I prefer to someone actively controlling the steering with me.