Is this one of the first ARF's you put together?

The placement of the formers is not critical in a fiberglass fuse, as long as they do their job of re-inforcing the fuse.

Worry about the alignment of the rudder to the elevator, and the alignment of the rudder to the wings. These are critical.

Ideally you want everything perpendicular with only about 1/8" of variance or so, though planes will fly well with more than that.

You can sometimes heat a fiberglass fuse with a heat gun to bend anything back that might be slightly out of aligment.

The elevator and wings alignments are controlled by sanding the proper surfaces to get everything square.