1lb, that's a lot...that's on top of retracts ?
You might as will install a bigger engine becuase you're going to need the power to pull it.
That's a brick, brick.

Have you moved the batteries forward or under that tank ?
Did you mount the eninge forward enough ?

When you determind the CG... was it from the leading edge of the wing or the former. On a tappered wing model it can be confusing
if the the manufacture is not especific or show it on a plan. You might want to double check where they want you to take the measurement from.
If they ment from the former instead of the LE...it'll throw you off.

CG is important becuase, if you're a noobie...it might be too much model for you. The further back the more sensitive the model will feel.