There is nothing wrong with putting lots of weight towards the tail of the plane, as long as it is secure and everything balances correctly.
If you don't mind having a plane that is much heavier then originally designed i.e. higher wing loading.
I would try to shift the servos and or rx and battery around. Also look at a light weight spinner nut and light wheit wheels especially for the nose gear.
Don't take this the wrong way I have the CG machine also and the rulers are metric on one side and standard on the other any chance you are using the wrong side for measurement??