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Personally I sprinkle. I don't use a binder, like mustard, instead I let the meat "rest" and let the salt in the rub draw moisture out of the meat to make the rub get pasty. It's all personal preference though. I use to rub but it makes a mess, sprinkling is easier.
As for smoke penetration I...
Don't know the smoker. Is it Dutch made? (just guessing). I also couldn't find any reference to it on Amazon.
If it won't heat past 170, I would suggest a bad element. Is it analog or digital? Take some pictures of it on the inside and of the controller.
You want to avoid billowy white smoke, keep the top vent wide open. You want to see thin blueish smoke or just a heat signature with a touch of smoke in it coming out of the exhaust. Don't soak your chips and think about getting an A-Maze-N pellet tray somewhere down the road (beats the heck out...
You can use pretty much anything you want for the pork and beef. I'd go light on the fish, don't want to overwhelm the fish with wood flavor.
Personally, apple or pecan for the pork. Oak or hickory for the beef. I always use something light, like lilac or cherry, for fish because I like the...
Praying for all the fine folks in Texas. Disaster crews in my area have already packed up and are ready to make the drive (2000 mi) to help out. They are bringing a ton of stuff.
Tough to find up here too. I've only found one place. That's Blood Farm over in Groton but that's a 100 mile round trip from me, so I don't make it that often but when I do, I take the big coolers and pack them.
devilrafa, where are you?
Opening up the exhaust should be your first priority. 3" (76mm) diameter is a good starting point. About 20" (500mm) in height should get some flow in the Cooking Chamber (CC). And Go!
And leave the chamber alone that looks fine for size.