When I switched my Aventure to 170mm cranks I had my first pedal strike in over ten years, BUT, when I first got "bomber" (my old 26" cruiser) a decade ago when I upped it to a nice aluminum crankset I had strikes the first couple weeks until I trained myself on it. I'm no stranger to low BB's with long cranks. It's all a matter of adjusting to how the bike works.
With the motor it's like I forgot a lot of the basics of just riding a bike with longer cranks. Keep the pedals level in deep turns, do not pedal and let momentum do the work.
I do think that since I got the "small" Aventure that's part of it. I'm 5'4" tall and even the small is a bit dicey getting on and off, though their oddball twisted top tube can almost be used like a step-through... and in hindsight I kind of regret not getting the step-through! Which is odd since generally when I try to get on/off step-through bikes I fall flat on my arse. For me step-throughs are usually harder.
I did a quick compare to the other two 26" bikes in my garage. The BB of the Aventure is clearly a half inch closer to the ground on mine despite the larger diameter tires.
Overall I kind of wish the Aventure was about six inches longer. My swapping in cruiser bars ended up needing the longest gooseneck I could find.