That isn't right. Can you give us a link to the kit you got? The only shogun kit I have found is a regular 510 kit that comes with just an atomizer... if what you have is an atomizer, 3 drops is about the most you will get in there before it starts leaking all over. 5ml of juice in 20 puffs? That's crazy... get us a little more info and we can nail down the problem for sure!
Edit: think I might have found the problem... this appears to be a 510 with what's called a vgomizer... never heard of it but this is what I found:
How does the vgomizer system work?
Vgomizer has a tank cartridge self feeds the atomizer, without cotton, no liquid leak and large liquid storage. compared with precious e-cigarette products all have cotton filler or a cloth membrane to suspend the smoking liquid, while vgomizer waits for a combination gravity and a siphoning effect by the nickel mesh over the actual heating element of the atomizer to be delivered to the atomizer for vaporization. it has the new tank system for dripping
e-liquid directly into its 1.0ml tank cartridge without the use of tissue inside the tank. The revolutionary new e-cigarette makes dripping easier without the use of tissue inside the tank. So we call it vgomizer system.
CaCO3Girl it sounds like the middle piece, the one holding the juice, is leaking like a sieve. If you got another vgomizer with your kit, use it and see if you have the same issues. If not, contact the supplier you got the kit from.
Another option would be to find some decent cartomizers. It's like what you've got, but they have a cotton-like filler that holds on to the juice and won't leak all over the place. There are a lot of cartomizers to choose from, Boge 2.0's being very popular.