I agree that it could be related to which side you sleep on. Using a silk or satin pillowcase can help. So can lifting your hair up when you lay down, so that you're not laying on the canopy when you sleep. To ensure that the majority of your hair isn't directly under your head as you sleep, many people "pineapple" (put it up in a very high ponytail using a scrunchy). My hair isn't quite long enough for that, but I've found that putting it in two high pigtails accomplishes pretty much the same thing. Others cover their hair with a silk or satin scarf or bonnet at night.

It could also be related to whether you're right or left handed. I scrunch better with my right hand than with my left, which can actually be to the advantage of the hair on the left side of my head. So I have to think about it more when I scrunch on the right side.

Another problem could be that it can be difficult to get the same amount of product into all of your hair if you don't section first.

And, as others have said, it could be that your hair hasn't all recovered equally well from your pre-CG days. Deep treatments can help that along.
Peace,
Morgan

Baby Fine 3B, low porosity, normal density and elasticity
CGing since July 2008