The bigger CMP planes fly better but every RC plane is the same in one respect and CMP is in this category . CMP did a great job on the "candy dressing on the small planes" as a result mnay builders get lost in the candy .
With that said 1)keep them as light as possible -watch how you use your expozy
2)CG is critical , use a CG formula to ensure its correct
3)INcidence -use a tool to measure the stab , the basic set up on these planes will have the stabs incodence wrong , aslo make sure your wing incidence is also correct .
4)use a wood propeller until you get all of these excatly correct , this way if you nose over , or land hard you can get away with a broken prop and not a bent engine shaft or torn out firewall