I wouldn't give up yet on the pellet smoker. Every smoker has a few learning points and curves. That is half the fun, learning how to work your smoker.
I would give it another try at 250.
Use a cold pork butt, throw on a mustard slather, use a salty bbq rub and smoke it for 1 1/2 hrs per pound.
some prefer different brands and flavors of pellets. I cant give any recommendations.
I think most pellet grills use about a pound an hour. You may be limiting the smoke from the lower temps. Crank it up.