As someone currently progging P8S, I wouldn't mind seeing some changes to the loot system.

For example, the tome cap being increased from 450 to 500, to allow players to buy a non-leg/chest piece with their weekly tomes.

I also would like to see the augment materials more evenly spread out, as P5S often becomes irrelevant after players have their BiS accessories. If P5S dropped the accessory augment, P6S the gear augment, and P7S the weapon augment, doing the fights would probably be more fun.

I also believe augment materials themselves should be able to be earned through Criterion Savage, as they're often the hardest item to obtain in significant quantities (up to 30 for an 8 person static).

I'd also like to see Savage unlocked a lot earlier than it currently is, maybe the first major patch after a tier's released, so 6.3 in this tier's case.