I am making an underquilt using Climashield XP. I've decided to go with two layers of combat (0.9in ea). I am planning on a differential cut in the shell (+1.75in) to avoid compressing the insulation.
My question is, should I also do a differential cut (+0.875in) between the insulation layers? Will it help with loft? Could it hurt anything?
From a mathematical perspective it makes sense that this would help loft by not stretching the outer layer. The only problem I could see with this would be gaps between layers, but that seems unlikely to me and it will be loop quilted.