I would replace the Nobby Nics as well, but probably for either Hans Dampf or Magic Mary as the weight on minions are about 1200g-1350g. 14.34kg is still very good.
I can't get away with single ply, I weigh nearly 100kg in kit and I'm not a smooth rider. I need the reliability of 2ply, so I went for the Hans Dampf as the trails are mostly dry and they run tubeless very well.