As I stated earlier: We will have to agree to disagree.
I've read it from Clarence Lee in many magazine articles that he has authored specifically on inverted model engine tuning. The tank height should be around 1/4" above the centerline of the carb.
I believe him, I trust him (have for 30 years now) and I will continue to follow his suggestion.
Oh, and this too:
http://en.wikipedia.org/wiki/Pascal%27s_Law