I think someone beefed up his 4*60's tail end...
Mine balanced correctly with a O.S. .91 FS (weighs less with muffler than my K&B .61 with its muffler) and the battery was over the TE of the wing. No lead anywhere...
The 4*60 can handle having some added weight. I added retracts to mine just to add weight to it. (Well... I wanted to "play with" retracts too...

) And it was still a floater.
BTW.. with the retracts pulled, and the stock landing gear installed... the battery had to be move back 5 more inches.