http://store.yahoo.com/ehobbies-com/ttras6073.html
http://store.yahoo.com/ehobbies-com/ttras6074.html
Beeza, with the info you gave, it sounds like you may just be getting into a higher wing loading than you are used to. The other thing is that the CG given on plans is usually very conservative. Double-check it using the calc at this link.
http://www.geistware.com/rcmodeling/cg_super_calc.htm