I thought on the gen4, that if the bike came with 165mm cranks the system was optimized for 165mm or less
I think I read about this on the forum somewhere
The big brands may design and sorce there bits from China but they have there our guys supervising production of the products to make sure they there worthy to use on there Bikes
No mate
I must admit I still like to run my cabling out side to me it's just more convenient when swapping things out and servicing
I have slackened the head angle to 64°
I'm finding it ok