I have just spent the evening checking out the C of G.
For it to go where I think it should be I have had to add 629g of lead. Thats 22.2 ozs.
I then weighed the model using scales for weighing suit cases and it seems to weigh in at 10.5 pounds or 4.76 kilograms.
Adding 22.2ounces of weight has not helped at all.
Hope it flies this time.
Maybe Sunday. We shall see.

Ray.