Prior to my Bradley, I had a canister style electric smoker - same set up as yours it sounds like....
Heating element/wood on the bottom, water bowl above that, 3 racks above that....
I've always used the top rack and left the vents open - closer to the bottom got cooked way to fast for me.
After my experience with the Bradley, quite honestly, I'd have to say those cannisters are poor at best...thin walled, no insulation
Perhaps you can thank pops and ask if he would mind if you took it back and got a refund and used that towards a Bradley..Chez Bubba can make things work for you there!
Good luck on whatever you decide
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"A mans got to know his limitations"
Glendora, CA - USA!