That sounds about normal for a Stick. You can cut a hatch opening on the underside at the back of the fuse, just in front of the tail feathers and add the weight there. Replace the hatch with your cutout and cover or don't cover the choice is yours.

Or move your servos for Elev. and rudder to the backend of the fuse. There are some post in RCU with pictures showing examples. Do a search.