RE: Nitro Planes Bobcat
I e-mailed you are replied to you in the other thread as well...
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It sounds like you had the Nitro Models Bobcat .50. Is that correct? Did you get the one that is retract ready?
As posted here, the C.G. should be set to approximately 10.3"-10.5" from the leading edge of the wing at the wing root.
The plane will fly with the gear as it comes, but it is important to make sure that the attitude of the plane at rest on the ground has a positive incidence relative to the ground. If you don't do this the plane will not lift off the runway at run-up.
There was no need to change out the stab as you've done. Many here have flown it as is.
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As everyone in the other thread has suggested, it sounds like you may have set the CG wrong initially which caused the problem.
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Everyone there seems to be having a lot of good luck with this plane going as far as installing turbines ( !!! ) in it.