Good for your loving wife to buy you an eCig! Unfortunately, these do not work that well. They are too small. The battery does not last that long, and it is next to impossible to refill the cartridges. I got one from an on-line promotion. I gave it to a friend after buying an eGo type PV. You need power (good batteries) and fuel (good eJuice) to get things rolling on this vaping course. Use it, but I would not spend any more money on making it work "better".
Get something like this:
eGo Mega Dual Coil Cartomizers
Or this:
Riva SE 510 Kit | Sweet-Vapes E-Liquid
The second one will cost you as much as it wil just trying to get your Fifty-One working "better" - which will be nearly impossible.
Keep the one your wife gave you and realize it might have been what got you on the vaping trail, but use a full size Personal Vape device (PV) if you want the full experience without a lot of hassle.
Cheers!