Don't soak the chips. It isn't needed in an electric smoker. I'll let everyone else argue whether it is needed at all in any type of smoker.
What didn't you like about the smoke output? Amount of smoke showing from the smoker or amount of smoke flavor in the pork?
You'll never (or shouldn't) get billowing clouds of smoke with an electric smoker. All you want is TBS (thin blue smoke) with any smoker, regardless of heat source, so that's fine. The biggest pain with the electrics is adding chips every 45 minutes to an hour, unless the 40 chip trays are quite a bit bigger than the 30. There are two good remedies for this with
Masterbuilt smokers. One is the
AMNPS you mentioned. The other is to buy the Cold Smoking attachment for the
Masterbuilt line. I use the cold smoking attachment all the time because the convenience of loading the chimney and flipping the switch for six-eight hours of smoke outweighs having to light the
AMNPS for me. I know lots of people here can light one with their eyes closed but it is a much more involved process than a simple flip of the switch. The
AMNPS is a great product and I do use it for smokes that will exceed 10 hours but for most of what I do I love the cold smoker because it maintains the set and forget feel of the electric itself.