I just got a Rotor Concept HPQ1. I've trimmed it out all the way to the various degrees possible, and it still wants to tip backwards, regardless of where I put the battery. In the video below I've got the battery shifted forward about 1/3 of the way overlapping under the camera (pushing the center of gravity way forwards). At the end of the video you can even see I let the battery fall forwards and dangle in the front, and it still wants to tip backwards. Any suggestions?

I know it's hard to see from the video, but I have trimmed it out as far as I can go. It helps, but ultimately it still wants to tip backwards significantly.

Thanks in advance!