ORIGINAL: Roberto B.
Maybe is because your plane is sooo.. (cough cough).... "unusual" since the actual trend in F3A.
I suggest you to riconsider totally your way of mounting the engine. I think it's a litte under designed for the massive torque of these motors. Try to take advantage of the full width of the firewall.
Yes it is a bit unusual but my hopes are that it will fly well enough to be competitive up to Advanced class in my region. I do still fly IMAC and wanted a pattern airplane that flies simular. I will investigate the mount a bit more however it is much mose sturdy then the mount the motor came with. My biggest concern right now is the weight.