I have a CNC dual tail housing that I fabricated myself, and it is slightly heavier that the commercially available unit. The two motors don't get hot, not even warm, and I have the G90 gyro. And I don't have any heat sinks on the tail motors. The housing itself, being metallic with lots of surface, seems to be enough to keep the motors cool. So Removing the heat sinks will help your "load and balance equation", without any negative effect on the motors in my opinion.

Also, since the dual tail arrangement is more responsive that stock, you can, if you want, shorten the tail boom a little. This would also help to balance your bird, but I did not need to do that. (I have the stock skids) Just make sure that both rotors cannot come in contact. Push down on the main rotor and rotate the tail rotor so that they come end to end, and measure the distance between the two. Remove just a little less, and you will be in business.

I can balance my BCPP perfectly by pushing the battery as far forward as it will go. I mean that the front of the battery is entirely supported by the canopy, and the back of the battery is supported by the rubber band on the battery holder.

I also have a Thunder Power Pro-Lite TP-1320 mah battery. I can also balance the heli with it, and without any modification.

Hope this helps,

Good luck and safe flying
Georges