Kelly,
    Sorry to say that I'm no aerodynamics expert and without actually seeing 
your glider I can only try to point you in the right direction.  
Try this:  Block your glider on a workbench with 2 pieces of 2 x 4 parallel 
o
the fuse.  If the airfoil is a flat bottom or close to it then it'll make 
ife
easier.  Use a carpenters level to get the wing airfoil incidence @ 0 
egrees,
tehn check out your tailplane indidence.  It should be close to being level 
s
well. What you were describing did sound like an incidence problem and if 
you're grossly off then it will show up in that process.  From what I 
understand, when the horiz stab is off its incidence, trimming the elevator 
n
essence produces an undercambered airfoil.  This then leads to trim changes 
t
various speeds.  The location of your CG is an aerodynamic safety valve.  
Since the CG is forward of the wings center of lift the tail has to produce a 
downward pressure to hold the nose up.  As a stall is approached, the tail 
fails to provide enough downforce and the nose of the plane drops.  As 
airspeed builds, enough downforce is regained so that you regain control.  
ow
far forward you want the CG is dependent on how much of a safety factor you 
want to have.  Rearward CG's are disasterous because as the plane stalls the 
nose goes UP!  This gets you deeper in the stall and deeper in trouble. 
Lastly, if you do have questions about the designed set up try your local 
hobby shop or distributer.  Let me know what you find.
         -]\/[ax
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