I have an OS 120 FS in mine and it is nose heavy. I just put my battery as far back as I could without surgurey but it would still require moving it right to the tail or adding about 3 ozs. to the tail. I tried it a bit nose heavy, liked it that way and never bothered to change anything.

If I was starting all over again I would have used a YS 110 ( lighter ) and moved the fuel tank to the CG. Maybe the next one