As a point of comparison, I would have needed to use an equal amount of weight to balance my Bobcat .50 due to employing an oversized engine.

I ended up stuffing a slightly larger and purposely heavier battery pack in the very tip of the nose.

This brought the C.G. almost perfectly into spec once everything was in place w/o the need for all of the added weight.

Remember that shifting a bit of weight around to an extreme "leverage point" as I did, can have a rather dramatic effect on the C.G.

This is one reason that those rather light 2oz spinner weights are so effective in correcting tail heavy planes.