Difficult to tighten the harness straps

I have 2 other Graco Nautilus 3-in-1 carseats and they are wonderful. However, this updated model does not require you to remove the straps as your child grows. All you have to do is adjust the headrest. And I believe this is the problem. The straps are extremely difficult to tighten, something I never experienced with the older model. Perhaps it is because the straps weave through the back of the carseat and down to the headrest, causing too much friction. I spoke with Graco via phone and they said it should not be difficult to tighten the straps. Not sure if mine is defective or just how this particular model carseat is made.

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