Bolerpilot,
It is common knowledge that words written on on forums can be slightly misinterpreted. When people talk to one another in real life their facial expressions,tone and hand gestures all convey some of the subtext of what they are saying. Typed into a forum this is missing.
I don't think that anyone is deliberately trying to belittle or be vindictive, rather I think they speak from a point of concern for your well being. If we as a group of aviators want to reduce the significant accident rate then we need to speak up to help others who may not understand the danger of the situations they are in and that is what I think that the posters above were trying to do. They have either experienced the issues that come with a rearward CofG or have read and heard stories form those that have.
My own rear CG of G experience was in a glider. I was taking a friend for a fly and she was smaller than others I had taken previously. We were exactly on the rear CofG limit and well under the MTOW. On tow all was good but once off the pitch control forces were very much lighter and the aircraft was significantly more twitchy. It took a lot more concentration to fly. In the landing flare there was almost no "feel".
She was probably only 10kg lighter than others that I had taken for a fly but it made a huge difference, we we still within the aircrafts envelope but the handling was radically different. I have a very healthy respect for the rear CG limit following this and dont want to experience an aircraft outside its envelope. It could be impossible to fly.
The FAA have quite a good guide to weight and balance. With the information in it you could estimate how much the CofG would change when you move the battery and weather this is completly compensated for by removing the tail weights you currently have.
It is available here:
https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/media/FAA-H-8083-1.pdf
Nobody