I have had 4 .10 size Shrikes now. I currently have one with a .25fp and one with a .32sx. Some of the mods are, moved firewall 1/4" back, battery all the way to the back, beef up the wing,fully sheeted the wing, solid balsa sheet to fill in the area by the fins. Make sure you have dual rates set-up for the elevator. You will need as much elevator as you can get when landing. So far the one with the .32 has been the best. It is now boring to fly the other one now.
Good Luck,
Craig
Craig's Shrike