I'd buy another Akorn in a minute. I've had one for over a year. I never modified the bottom vent cuz my target temps were always right on. My dome lid thermo is also exact.
It's versatile as can be. I also have a weber kettle and it can't come close to holding temps like the Akorn can for smoking. The kettle is a wannabe smoker. I'll be selling it in the spring.
Keep your gas grill. I use mine alot during the week for a fast grilled dinner.
Use lump in the Akorn for smoking.