smoke ring is really just cosmetic. one trick I found for getting a good ring in an electric is bark. yes. tree bark. get some of the bark of whatever wood you're using, break it up and mix it with your chips.
also search the forums for 'smoke ring' and you'll find a lot of research on it.
http://www.smokingmeatforums.com/t/128506/the-smoke-ring-mystery
long and short is it's caused by NO2 (nitrogen dioxide - corrected) being formed during the smoking process. the bark apparently contains a lot of nitrogen rich compounds, which offgas while it's being cooked in the coals/fire. not to mention stick burners or charcoal units wind up with twigs and barky pieces put in.. electric (and propane) usually have chips or pellets, which have a very low amount of bark, if any at all.
well, the NO2 bonds to the surface of the meat in a process very similar to using a cure (in the same way it preserves the color of the meat) - it binds to the myoglobin and retains the pink color.
so.. long blather short - add bark. it's got the largest amount of nitrogen-containing material (excepting leaves) on the tree, and enriching your smoke composition should give you that nice pretty ring. (and I will admit, it's hard to look at a slice of brisket and not see it....kinda seems a bit wrong and disappointing..)
I'd usually sub out about 1/4 of my chips for bark shreds or chips (I've also gotten good results with the hulls, if you're using a nut wood.. like pecan - bother the local sheller/dealer for their hulls.. they're glad to be rid of them, and they're fairly nitrogen rich as well)
as for this particular model of smoker? some of the wiser heads here could tell you more about that particular one..
I'm familiar with the
masterbuilt 30" analog model, which I'm currently cooling my heels over waiting for some spare money to come in so I can get it fixed (and modded)
one thing that's almost universal with the masterbuilts though, is there's some disappointment about the size of the chip tray/pan and the amount of smoke generated. you'll find a lot of guys have added an AMNS or
AMNPS (
amazen smoker - sawdust, or
amazen pellet smoker - pellets) to their MES. I'm actually planning on adding an
AMNPS (not sure on tube or tray yet) to my analog electric.