I think the weight is different here. I guess its the part of the world, our gravity pull is probably higher here nearer to equator.
I just reverted my racket grip back to the gamma's cos I find that using the Yonex Super Leather grip, the gripsize somehow is smaller and I can't get use to it.
Anyway, since I just took out the Yonex Super Leather grip, I can weight it trimmed now (for RDX's grip length) and its only 16gm! Which is exactly the case since my racquet weight 10-11gm lighter than with Gamma Leather Grip. But I think the gripsize is smaller due to the thickness of Yonex's grip.