After a nasty encounter with a limbo pole, I've repaired my Morris Knife. I flew it yesterday and it flys well, however....

When it hit the pole the engine ripped out. It pulled some of the wood mount rails with it. I was able to piece the mount together using the same broken parts and 30 minute epoxy. When done, it appeared very strong. After flying I noticed that the mounts were starting to crack at the very end (front of plane) along the repair area.

What is the best way to repair this? Any pictures of repairs would be great. I thought about cutting the entire mounts out and using new wood, but I don't think it would hold any better that the original because they were somewhat "interlocking" from the breaks. Thanks.