Try taking the plane up high and slowing it until it stalls. All that I've seen would almost come to a standstill. It's often a function of how low you've gotten the engine to idle and whether or not the prop pitch at that rpm works. This will show you for sure how slow it can go with you on the sticks and the elevator thows where you've got 'em. And it'll go that slow on approach or anywhere else.

Moving the CG back really doesn't change much about approach speed other than how effective the elevator is going to be and how quickly it'll bite you when it stalls. If you're not worried about that tapered wing stalling on approach, you really don't have the engine idle low enough.

Which engine did you put into it? And what prop? Evolution engines will idle down reliably, especially after the beginner protection bits are removed.